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annotate runtime/doc/pattern.txt @ 25979:05065e623c89
Added tag v8.2.3522 for changeset 40b17deb294f4868e46b295c67add949c23a7b3f
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Sat, 16 Oct 2021 19:00:04 +0200 |
| parents | 3b34837f4538 |
| children | 3e661b0cf500 |
| rev | line source |
|---|---|
| 25402 | 1 *pattern.txt* For Vim version 8.2. Last change: 2021 Jul 16 |
| 7 | 2 |
| 3 | |
| 4 VIM REFERENCE MANUAL by Bram Moolenaar | |
| 5 | |
| 6 | |
| 7 Patterns and search commands *pattern-searches* | |
| 8 | |
| 9 The very basics can be found in section |03.9| of the user manual. A few more | |
| 10 explanations are in chapter 27 |usr_27.txt|. | |
| 11 | |
| 12 1. Search commands |search-commands| | |
| 13 2. The definition of a pattern |search-pattern| | |
| 14 3. Magic |/magic| | |
| 15 4. Overview of pattern items |pattern-overview| | |
| 16 5. Multi items |pattern-multi-items| | |
| 17 6. Ordinary atoms |pattern-atoms| | |
| 18 7. Ignoring case in a pattern |/ignorecase| | |
| 714 | 19 8. Composing characters |patterns-composing| |
| 20 9. Compare with Perl patterns |perl-patterns| | |
| 21 10. Highlighting matches |match-highlight| | |
| 24636 | 22 11. Fuzzy matching |fuzzy-match| |
| 7 | 23 |
| 24 ============================================================================== | |
| 3153 | 25 1. Search commands *search-commands* |
| 7 | 26 |
| 27 */* | |
| 28 /{pattern}[/]<CR> Search forward for the [count]'th occurrence of | |
| 29 {pattern} |exclusive|. | |
| 30 | |
| 31 /{pattern}/{offset}<CR> Search forward for the [count]'th occurrence of | |
| 32 {pattern} and go |{offset}| lines up or down. | |
| 33 |linewise|. | |
| 34 | |
| 35 */<CR>* | |
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36 /<CR> Search forward for the [count]'th occurrence of the |
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37 latest used pattern |last-pattern| with latest used |
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38 |{offset}|. |
| 7 | 39 |
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40 //{offset}<CR> Search forward for the [count]'th occurrence of the |
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41 latest used pattern |last-pattern| with new |
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42 |{offset}|. If {offset} is empty no offset is used. |
| 7 | 43 |
| 44 *?* | |
| 45 ?{pattern}[?]<CR> Search backward for the [count]'th previous | |
| 46 occurrence of {pattern} |exclusive|. | |
| 47 | |
| 48 ?{pattern}?{offset}<CR> Search backward for the [count]'th previous | |
| 49 occurrence of {pattern} and go |{offset}| lines up or | |
| 50 down |linewise|. | |
| 51 | |
| 52 *?<CR>* | |
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53 ?<CR> Search backward for the [count]'th occurrence of the |
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54 latest used pattern |last-pattern| with latest used |
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55 |{offset}|. |
| 7 | 56 |
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57 ??{offset}<CR> Search backward for the [count]'th occurrence of the |
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59 |{offset}|. If {offset} is empty no offset is used. |
| 7 | 60 |
| 61 *n* | |
| 62 n Repeat the latest "/" or "?" [count] times. | |
| 6647 | 63 If the cursor doesn't move the search is repeated with |
| 64 count + 1. | |
| 16808 | 65 |last-pattern| |
| 7 | 66 |
| 67 *N* | |
| 68 N Repeat the latest "/" or "?" [count] times in | |
| 16808 | 69 opposite direction. |last-pattern| |
| 7 | 70 |
| 71 *star* *E348* *E349* | |
| 72 * Search forward for the [count]'th occurrence of the | |
| 73 word nearest to the cursor. The word used for the | |
| 74 search is the first of: | |
| 75 1. the keyword under the cursor |'iskeyword'| | |
| 76 2. the first keyword after the cursor, in the | |
| 77 current line | |
| 78 3. the non-blank word under the cursor | |
| 79 4. the first non-blank word after the cursor, | |
| 80 in the current line | |
| 81 Only whole keywords are searched for, like with the | |
| 18831 | 82 command "/\<keyword\>". |exclusive| |
| 7 | 83 'ignorecase' is used, 'smartcase' is not. |
| 84 | |
| 85 *#* | |
| 86 # Same as "*", but search backward. The pound sign | |
| 87 (character 163) also works. If the "#" key works as | |
| 88 backspace, try using "stty erase <BS>" before starting | |
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89 Vim (<BS> is CTRL-H or a real backspace). |
| 7 | 90 |
| 91 *gstar* | |
| 92 g* Like "*", but don't put "\<" and "\>" around the word. | |
| 93 This makes the search also find matches that are not a | |
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94 whole word. |
| 7 | 95 |
| 96 *g#* | |
| 97 g# Like "#", but don't put "\<" and "\>" around the word. | |
| 98 This makes the search also find matches that are not a | |
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99 whole word. |
| 7 | 100 |
| 101 *gd* | |
| 102 gd Goto local Declaration. When the cursor is on a local | |
| 103 variable, this command will jump to its declaration. | |
| 104 First Vim searches for the start of the current | |
| 105 function, just like "[[". If it is not found the | |
| 106 search stops in line 1. If it is found, Vim goes back | |
| 107 until a blank line is found. From this position Vim | |
| 108 searches for the keyword under the cursor, like with | |
| 109 "*", but lines that look like a comment are ignored | |
| 110 (see 'comments' option). | |
| 111 Note that this is not guaranteed to work, Vim does not | |
| 112 really check the syntax, it only searches for a match | |
| 113 with the keyword. If included files also need to be | |
| 114 searched use the commands listed in |include-search|. | |
| 115 After this command |n| searches forward for the next | |
| 116 match (not backward). | |
| 117 | |
| 118 *gD* | |
| 119 gD Goto global Declaration. When the cursor is on a | |
| 120 global variable that is defined in the file, this | |
| 121 command will jump to its declaration. This works just | |
| 122 like "gd", except that the search for the keyword | |
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123 always starts in line 1. |
| 7 | 124 |
| 523 | 125 *1gd* |
| 126 1gd Like "gd", but ignore matches inside a {} block that | |
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127 ends before the cursor position. |
| 523 | 128 |
| 129 *1gD* | |
| 130 1gD Like "gD", but ignore matches inside a {} block that | |
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131 ends before the cursor position. |
| 523 | 132 |
| 7 | 133 *CTRL-C* |
| 134 CTRL-C Interrupt current (search) command. Use CTRL-Break on | |
| 18972 | 135 MS-Windows |dos-CTRL-Break|. |
| 7 | 136 In Normal mode, any pending command is aborted. |
| 137 | |
| 138 *:noh* *:nohlsearch* | |
| 139 :noh[lsearch] Stop the highlighting for the 'hlsearch' option. It | |
| 140 is automatically turned back on when using a search | |
| 141 command, or setting the 'hlsearch' option. | |
| 142 This command doesn't work in an autocommand, because | |
| 143 the highlighting state is saved and restored when | |
| 144 executing autocommands |autocmd-searchpat|. | |
| 1620 | 145 Same thing for when invoking a user function. |
| 7 | 146 |
| 147 While typing the search pattern the current match will be shown if the | |
| 148 'incsearch' option is on. Remember that you still have to finish the search | |
| 149 command with <CR> to actually position the cursor at the displayed match. Or | |
| 150 use <Esc> to abandon the search. | |
| 151 | |
| 152 All matches for the last used search pattern will be highlighted if you set | |
| 153 the 'hlsearch' option. This can be suspended with the |:nohlsearch| command. | |
| 154 | |
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155 When 'shortmess' does not include the "S" flag, Vim will automatically show an |
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156 index, on which the cursor is. This can look like this: > |
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157 |
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158 [1/5] Cursor is on first of 5 matches. |
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159 [1/>99] Cursor is on first of more than 99 matches. |
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160 [>99/>99] Cursor is after 99 match of more than 99 matches. |
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161 [?/??] Unknown how many matches exists, generating the |
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162 statistics was aborted because of search timeout. |
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163 |
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164 Note: the count does not take offset into account. |
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165 |
| 3153 | 166 When no match is found you get the error: *E486* Pattern not found |
| 167 Note that for the |:global| command this behaves like a normal message, for Vi | |
| 168 compatibility. For the |:s| command the "e" flag can be used to avoid the | |
| 169 error message |:s_flags|. | |
| 170 | |
| 7 | 171 *search-offset* *{offset}* |
| 172 These commands search for the specified pattern. With "/" and "?" an | |
| 173 additional offset may be given. There are two types of offsets: line offsets | |
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174 and character offsets. |
| 7 | 175 |
| 176 The offset gives the cursor position relative to the found match: | |
| 177 [num] [num] lines downwards, in column 1 | |
| 178 +[num] [num] lines downwards, in column 1 | |
| 179 -[num] [num] lines upwards, in column 1 | |
| 180 e[+num] [num] characters to the right of the end of the match | |
| 181 e[-num] [num] characters to the left of the end of the match | |
| 182 s[+num] [num] characters to the right of the start of the match | |
| 183 s[-num] [num] characters to the left of the start of the match | |
| 184 b[+num] [num] identical to s[+num] above (mnemonic: begin) | |
| 185 b[-num] [num] identical to s[-num] above (mnemonic: begin) | |
| 667 | 186 ;{pattern} perform another search, see |//;| |
| 7 | 187 |
| 188 If a '-' or '+' is given but [num] is omitted, a count of one will be used. | |
| 189 When including an offset with 'e', the search becomes inclusive (the | |
| 190 character the cursor lands on is included in operations). | |
| 191 | |
| 192 Examples: | |
| 193 | |
| 194 pattern cursor position ~ | |
| 195 /test/+1 one line below "test", in column 1 | |
| 196 /test/e on the last t of "test" | |
| 197 /test/s+2 on the 's' of "test" | |
| 198 /test/b-3 three characters before "test" | |
| 199 | |
| 200 If one of these commands is used after an operator, the characters between | |
| 201 the cursor position before and after the search is affected. However, if a | |
| 202 line offset is given, the whole lines between the two cursor positions are | |
| 203 affected. | |
| 204 | |
| 205 An example of how to search for matches with a pattern and change the match | |
| 206 with another word: > | |
| 207 /foo<CR> find "foo" | |
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208 c//e<CR> change until end of match |
| 7 | 209 bar<Esc> type replacement |
| 210 //<CR> go to start of next match | |
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211 c//e<CR> change until end of match |
| 7 | 212 beep<Esc> type another replacement |
| 213 etc. | |
| 214 < | |
| 215 *//;* *E386* | |
| 216 A very special offset is ';' followed by another search command. For example: > | |
| 217 | |
| 218 /test 1/;/test | |
| 219 /test.*/+1;?ing? | |
| 220 | |
| 221 The first one first finds the next occurrence of "test 1", and then the first | |
| 222 occurrence of "test" after that. | |
| 223 | |
| 224 This is like executing two search commands after each other, except that: | |
| 225 - It can be used as a single motion command after an operator. | |
| 226 - The direction for a following "n" or "N" command comes from the first | |
| 227 search command. | |
| 228 - When an error occurs the cursor is not moved at all. | |
| 229 | |
| 230 *last-pattern* | |
| 231 The last used pattern and offset are remembered. They can be used to repeat | |
| 232 the search, possibly in another direction or with another count. Note that | |
| 24024 | 233 two patterns are remembered: One for "normal" search commands and one for the |
| 7 | 234 substitute command ":s". Each time an empty pattern is given, the previously |
| 2725 | 235 used pattern is used. However, if there is no previous search command, a |
| 236 previous substitute pattern is used, if possible. | |
| 7 | 237 |
| 238 The 'magic' option sticks with the last used pattern. If you change 'magic', | |
| 239 this will not change how the last used pattern will be interpreted. | |
| 240 The 'ignorecase' option does not do this. When 'ignorecase' is changed, it | |
| 241 will result in the pattern to match other text. | |
| 242 | |
| 243 All matches for the last used search pattern will be highlighted if you set | |
| 244 the 'hlsearch' option. | |
| 245 | |
| 246 To clear the last used search pattern: > | |
| 247 :let @/ = "" | |
| 248 This will not set the pattern to an empty string, because that would match | |
| 249 everywhere. The pattern is really cleared, like when starting Vim. | |
| 250 | |
| 133 | 251 The search usually skips matches that don't move the cursor. Whether the next |
| 7 | 252 match is found at the next character or after the skipped match depends on the |
| 253 'c' flag in 'cpoptions'. See |cpo-c|. | |
| 254 with 'c' flag: "/..." advances 1 to 3 characters | |
| 255 without 'c' flag: "/..." advances 1 character | |
| 256 The unpredictability with the 'c' flag is caused by starting the search in the | |
| 257 first column, skipping matches until one is found past the cursor position. | |
| 258 | |
| 133 | 259 When searching backwards, searching starts at the start of the line, using the |
| 260 'c' flag in 'cpoptions' as described above. Then the last match before the | |
| 261 cursor position is used. | |
| 262 | |
| 7 | 263 In Vi the ":tag" command sets the last search pattern when the tag is searched |
| 264 for. In Vim this is not done, the previous search pattern is still remembered, | |
| 265 unless the 't' flag is present in 'cpoptions'. The search pattern is always | |
| 266 put in the search history. | |
| 267 | |
| 268 If the 'wrapscan' option is on (which is the default), searches wrap around | |
| 269 the end of the buffer. If 'wrapscan' is not set, the backward search stops | |
| 270 at the beginning and the forward search stops at the end of the buffer. If | |
| 271 'wrapscan' is set and the pattern was not found the error message "pattern | |
| 272 not found" is given, and the cursor will not be moved. If 'wrapscan' is not | |
| 273 set the message becomes "search hit BOTTOM without match" when searching | |
| 274 forward, or "search hit TOP without match" when searching backward. If | |
| 275 wrapscan is set and the search wraps around the end of the file the message | |
| 276 "search hit TOP, continuing at BOTTOM" or "search hit BOTTOM, continuing at | |
| 277 TOP" is given when searching backwards or forwards respectively. This can be | |
| 278 switched off by setting the 's' flag in the 'shortmess' option. The highlight | |
| 279 method 'w' is used for this message (default: standout). | |
| 280 | |
| 281 *search-range* | |
| 625 | 282 You can limit the search command "/" to a certain range of lines by including |
| 283 \%>l items. For example, to match the word "limit" below line 199 and above | |
| 284 line 300: > | |
| 285 /\%>199l\%<300llimit | |
| 286 Also see |/\%>l|. | |
| 287 | |
| 288 Another way is to use the ":substitute" command with the 'c' flag. Example: > | |
| 7 | 289 :.,300s/Pattern//gc |
| 290 This command will search from the cursor position until line 300 for | |
| 291 "Pattern". At the match, you will be asked to type a character. Type 'q' to | |
| 292 stop at this match, type 'n' to find the next match. | |
| 293 | |
| 294 The "*", "#", "g*" and "g#" commands look for a word near the cursor in this | |
| 295 order, the first one that is found is used: | |
| 296 - The keyword currently under the cursor. | |
| 297 - The first keyword to the right of the cursor, in the same line. | |
| 298 - The WORD currently under the cursor. | |
| 299 - The first WORD to the right of the cursor, in the same line. | |
| 300 The keyword may only contain letters and characters in 'iskeyword'. | |
| 301 The WORD may contain any non-blanks (<Tab>s and/or <Space>s). | |
| 302 Note that if you type with ten fingers, the characters are easy to remember: | |
| 303 the "#" is under your left hand middle finger (search to the left and up) and | |
| 304 the "*" is under your right hand middle finger (search to the right and down). | |
| 305 (this depends on your keyboard layout though). | |
| 306 | |
| 14372 | 307 *E956* |
| 308 In very rare cases a regular expression is used recursively. This can happen | |
| 15033 | 309 when executing a pattern takes a long time and when checking for messages on |
| 14372 | 310 channels a callback is invoked that also uses a pattern or an autocommand is |
| 311 triggered. In most cases this should be fine, but if a pattern is in use when | |
| 312 it's used again it fails. Usually this means there is something wrong with | |
| 313 the pattern. | |
| 314 | |
| 7 | 315 ============================================================================== |
| 316 2. The definition of a pattern *search-pattern* *pattern* *[pattern]* | |
| 317 *regular-expression* *regexp* *Pattern* | |
| 190 | 318 *E76* *E383* *E476* |
| 7 | 319 |
| 320 For starters, read chapter 27 of the user manual |usr_27.txt|. | |
| 321 | |
| 322 */bar* */\bar* */pattern* | |
| 323 1. A pattern is one or more branches, separated by "\|". It matches anything | |
| 324 that matches one of the branches. Example: "foo\|beep" matches "foo" and | |
| 325 matches "beep". If more than one branch matches, the first one is used. | |
| 326 | |
| 327 pattern ::= branch | |
| 328 or branch \| branch | |
| 329 or branch \| branch \| branch | |
| 330 etc. | |
| 331 | |
| 332 */branch* */\&* | |
| 333 2. A branch is one or more concats, separated by "\&". It matches the last | |
| 334 concat, but only if all the preceding concats also match at the same | |
| 335 position. Examples: | |
| 336 "foobeep\&..." matches "foo" in "foobeep". | |
| 337 ".*Peter\&.*Bob" matches in a line containing both "Peter" and "Bob" | |
| 338 | |
| 339 branch ::= concat | |
| 340 or concat \& concat | |
| 341 or concat \& concat \& concat | |
| 342 etc. | |
| 343 | |
| 344 */concat* | |
| 345 3. A concat is one or more pieces, concatenated. It matches a match for the | |
| 346 first piece, followed by a match for the second piece, etc. Example: | |
| 347 "f[0-9]b", first matches "f", then a digit and then "b". | |
| 348 | |
| 349 concat ::= piece | |
| 350 or piece piece | |
| 351 or piece piece piece | |
| 352 etc. | |
| 353 | |
| 354 */piece* | |
| 355 4. A piece is an atom, possibly followed by a multi, an indication of how many | |
| 356 times the atom can be matched. Example: "a*" matches any sequence of "a" | |
| 357 characters: "", "a", "aa", etc. See |/multi|. | |
| 358 | |
| 359 piece ::= atom | |
| 360 or atom multi | |
| 361 | |
| 362 */atom* | |
| 363 5. An atom can be one of a long list of items. Many atoms match one character | |
| 364 in the text. It is often an ordinary character or a character class. | |
| 23164 | 365 Parentheses can be used to make a pattern into an atom. The "\z(\)" |
| 366 construct is only for syntax highlighting. | |
| 7 | 367 |
| 368 atom ::= ordinary-atom |/ordinary-atom| | |
| 369 or \( pattern \) |/\(| | |
| 370 or \%( pattern \) |/\%(| | |
| 371 or \z( pattern \) |/\z(| | |
| 372 | |
| 373 | |
| 5146 | 374 */\%#=* *two-engines* *NFA* |
| 4444 | 375 Vim includes two regexp engines: |
| 376 1. An old, backtracking engine that supports everything. | |
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377 2. A new, NFA engine that works much faster on some patterns, possibly slower |
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378 on some patterns. |
| 4444 | 379 |
| 380 Vim will automatically select the right engine for you. However, if you run | |
| 381 into a problem or want to specifically select one engine or the other, you can | |
| 382 prepend one of the following to the pattern: | |
| 383 | |
| 384 \%#=0 Force automatic selection. Only has an effect when | |
| 385 'regexpengine' has been set to a non-zero value. | |
| 386 \%#=1 Force using the old engine. | |
| 387 \%#=2 Force using the NFA engine. | |
| 388 | |
| 389 You can also use the 'regexpengine' option to change the default. | |
| 390 | |
| 391 *E864* *E868* *E874* *E875* *E876* *E877* *E878* | |
| 392 If selecting the NFA engine and it runs into something that is not implemented | |
| 393 the pattern will not match. This is only useful when debugging Vim. | |
| 394 | |
| 7 | 395 ============================================================================== |
| 840 | 396 3. Magic */magic* |
| 397 | |
| 23466 | 398 Some characters in the pattern, such as letters, are taken literally. They |
| 399 match exactly the same character in the text. When preceded with a backslash | |
| 400 however, these characters may get a special meaning. For example, "a" matches | |
| 401 the letter "a", while "\a" matches any alphabetic character. | |
| 840 | 402 |
| 403 Other characters have a special meaning without a backslash. They need to be | |
| 23466 | 404 preceded with a backslash to match literally. For example "." matches any |
| 405 character while "\." matches a dot. | |
| 840 | 406 |
| 407 If a character is taken literally or not depends on the 'magic' option and the | |
| 23466 | 408 items in the pattern mentioned next. The 'magic' option should always be set, |
| 409 but it can be switched off for Vi compatibility. We mention the effect of | |
| 410 'nomagic' here for completeness, but we recommend against using that. | |
| 840 | 411 */\m* */\M* |
| 412 Use of "\m" makes the pattern after it be interpreted as if 'magic' is set, | |
| 413 ignoring the actual value of the 'magic' option. | |
| 414 Use of "\M" makes the pattern after it be interpreted as if 'nomagic' is used. | |
| 415 */\v* */\V* | |
| 15281 | 416 Use of "\v" means that after it, all ASCII characters except '0'-'9', 'a'-'z', |
| 417 'A'-'Z' and '_' have special meaning: "very magic" | |
| 840 | 418 |
| 23466 | 419 Use of "\V" means that after it, only a backslash and the terminating |
| 420 character (usually / or ?) have special meaning: "very nomagic" | |
| 840 | 421 |
| 422 Examples: | |
| 423 after: \v \m \M \V matches ~ | |
| 424 'magic' 'nomagic' | |
| 23466 | 425 a a a a literal 'a' |
| 426 \a \a \a \a any alphabetic character | |
| 427 . . \. \. any character | |
| 428 \. \. . . literal dot | |
| 429 $ $ $ \$ end-of-line | |
| 840 | 430 * * \* \* any number of the previous atom |
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431 ~ ~ \~ \~ latest substitute string |
| 23466 | 432 () \(\) \(\) \(\) group as an atom |
| 433 | \| \| \| nothing: separates alternatives | |
| 840 | 434 \\ \\ \\ \\ literal backslash |
| 23466 | 435 \{ { { { literal curly brace |
| 840 | 436 |
| 437 {only Vim supports \m, \M, \v and \V} | |
| 438 | |
| 23466 | 439 If you want to you can make a pattern immune to the 'magic' option being set |
| 440 or not by putting "\m" or "\M" at the start of the pattern. | |
| 840 | 441 |
| 442 ============================================================================== | |
| 7 | 443 4. Overview of pattern items *pattern-overview* |
| 4444 | 444 *E865* *E866* *E867* *E869* |
| 7 | 445 |
| 446 Overview of multi items. */multi* *E61* *E62* | |
| 4444 | 447 More explanation and examples below, follow the links. *E64* *E871* |
| 7 | 448 |
| 449 multi ~ | |
| 450 'magic' 'nomagic' matches of the preceding atom ~ | |
| 451 |/star| * \* 0 or more as many as possible | |
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452 |/\+| \+ \+ 1 or more as many as possible |
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453 |/\=| \= \= 0 or 1 as many as possible |
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454 |/\?| \? \? 0 or 1 as many as possible |
| 7 | 455 |
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456 |/\{| \{n,m} \{n,m} n to m as many as possible |
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457 \{n} \{n} n exactly |
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458 \{n,} \{n,} at least n as many as possible |
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459 \{,m} \{,m} 0 to m as many as possible |
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460 \{} \{} 0 or more as many as possible (same as *) |
| 7 | 461 |
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462 |/\{-| \{-n,m} \{-n,m} n to m as few as possible |
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463 \{-n} \{-n} n exactly |
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464 \{-n,} \{-n,} at least n as few as possible |
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465 \{-,m} \{-,m} 0 to m as few as possible |
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466 \{-} \{-} 0 or more as few as possible |
| 7 | 467 |
| 468 *E59* | |
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469 |/\@>| \@> \@> 1, like matching a whole pattern |
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470 |/\@=| \@= \@= nothing, requires a match |/zero-width| |
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471 |/\@!| \@! \@! nothing, requires NO match |/zero-width| |
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472 |/\@<=| \@<= \@<= nothing, requires a match behind |/zero-width| |
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473 |/\@<!| \@<! \@<! nothing, requires NO match behind |/zero-width| |
| 7 | 474 |
| 475 | |
| 476 Overview of ordinary atoms. */ordinary-atom* | |
| 477 More explanation and examples below, follow the links. | |
| 478 | |
| 479 ordinary atom ~ | |
| 480 magic nomagic matches ~ | |
| 481 |/^| ^ ^ start-of-line (at start of pattern) |/zero-width| | |
| 482 |/\^| \^ \^ literal '^' | |
| 483 |/\_^| \_^ \_^ start-of-line (used anywhere) |/zero-width| | |
| 484 |/$| $ $ end-of-line (at end of pattern) |/zero-width| | |
| 485 |/\$| \$ \$ literal '$' | |
| 486 |/\_$| \_$ \_$ end-of-line (used anywhere) |/zero-width| | |
| 487 |/.| . \. any single character (not an end-of-line) | |
| 488 |/\_.| \_. \_. any single character or end-of-line | |
| 489 |/\<| \< \< beginning of a word |/zero-width| | |
| 490 |/\>| \> \> end of a word |/zero-width| | |
| 491 |/\zs| \zs \zs anything, sets start of match | |
| 492 |/\ze| \ze \ze anything, sets end of match | |
| 493 |/\%^| \%^ \%^ beginning of file |/zero-width| *E71* | |
| 494 |/\%$| \%$ \%$ end of file |/zero-width| | |
| 640 | 495 |/\%V| \%V \%V inside Visual area |/zero-width| |
| 7 | 496 |/\%#| \%# \%# cursor position |/zero-width| |
| 640 | 497 |/\%'m| \%'m \%'m mark m position |/zero-width| |
| 7 | 498 |/\%l| \%23l \%23l in line 23 |/zero-width| |
| 499 |/\%c| \%23c \%23c in column 23 |/zero-width| | |
| 500 |/\%v| \%23v \%23v in virtual column 23 |/zero-width| | |
| 501 | |
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502 Character classes: */character-classes* |
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503 magic nomagic matches ~ |
| 7 | 504 |/\i| \i \i identifier character (see 'isident' option) |
| 505 |/\I| \I \I like "\i", but excluding digits | |
| 506 |/\k| \k \k keyword character (see 'iskeyword' option) | |
| 507 |/\K| \K \K like "\k", but excluding digits | |
| 508 |/\f| \f \f file name character (see 'isfname' option) | |
| 509 |/\F| \F \F like "\f", but excluding digits | |
| 510 |/\p| \p \p printable character (see 'isprint' option) | |
| 511 |/\P| \P \P like "\p", but excluding digits | |
| 512 |/\s| \s \s whitespace character: <Space> and <Tab> | |
| 513 |/\S| \S \S non-whitespace character; opposite of \s | |
| 514 |/\d| \d \d digit: [0-9] | |
| 515 |/\D| \D \D non-digit: [^0-9] | |
| 516 |/\x| \x \x hex digit: [0-9A-Fa-f] | |
| 517 |/\X| \X \X non-hex digit: [^0-9A-Fa-f] | |
| 518 |/\o| \o \o octal digit: [0-7] | |
| 519 |/\O| \O \O non-octal digit: [^0-7] | |
| 520 |/\w| \w \w word character: [0-9A-Za-z_] | |
| 521 |/\W| \W \W non-word character: [^0-9A-Za-z_] | |
| 522 |/\h| \h \h head of word character: [A-Za-z_] | |
| 523 |/\H| \H \H non-head of word character: [^A-Za-z_] | |
| 524 |/\a| \a \a alphabetic character: [A-Za-z] | |
| 525 |/\A| \A \A non-alphabetic character: [^A-Za-z] | |
| 526 |/\l| \l \l lowercase character: [a-z] | |
| 527 |/\L| \L \L non-lowercase character: [^a-z] | |
| 528 |/\u| \u \u uppercase character: [A-Z] | |
| 529 |/\U| \U \U non-uppercase character [^A-Z] | |
| 530 |/\_| \_x \_x where x is any of the characters above: character | |
| 531 class with end-of-line included | |
| 532 (end of character classes) | |
| 533 | |
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534 magic nomagic matches ~ |
| 7 | 535 |/\e| \e \e <Esc> |
| 536 |/\t| \t \t <Tab> | |
| 537 |/\r| \r \r <CR> | |
| 538 |/\b| \b \b <BS> | |
| 539 |/\n| \n \n end-of-line | |
| 540 |/~| ~ \~ last given substitute string | |
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541 |/\1| \1 \1 same string as matched by first \(\) |
| 7 | 542 |/\2| \2 \2 Like "\1", but uses second \(\) |
| 543 ... | |
| 544 |/\9| \9 \9 Like "\1", but uses ninth \(\) | |
| 545 *E68* | |
| 546 |/\z1| \z1 \z1 only for syntax highlighting, see |:syn-ext-match| | |
| 547 ... | |
| 548 |/\z1| \z9 \z9 only for syntax highlighting, see |:syn-ext-match| | |
| 549 | |
| 550 x x a character with no special meaning matches itself | |
| 551 | |
| 552 |/[]| [] \[] any character specified inside the [] | |
| 4119 | 553 |/\%[]| \%[] \%[] a sequence of optionally matched atoms |
| 7 | 554 |
| 1620 | 555 |/\c| \c \c ignore case, do not use the 'ignorecase' option |
| 556 |/\C| \C \C match case, do not use the 'ignorecase' option | |
| 4444 | 557 |/\Z| \Z \Z ignore differences in Unicode "combining characters". |
| 558 Useful when searching voweled Hebrew or Arabic text. | |
| 559 | |
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560 magic nomagic matches ~ |
| 7 | 561 |/\m| \m \m 'magic' on for the following chars in the pattern |
| 562 |/\M| \M \M 'magic' off for the following chars in the pattern | |
| 563 |/\v| \v \v the following chars in the pattern are "very magic" | |
| 564 |/\V| \V \V the following chars in the pattern are "very nomagic" | |
| 4444 | 565 |/\%#=| \%#=1 \%#=1 select regexp engine |/zero-width| |
| 7 | 566 |
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567 |/\%d| \%d \%d match specified decimal character (eg \%d123) |
| 24 | 568 |/\%x| \%x \%x match specified hex character (eg \%x2a) |
| 569 |/\%o| \%o \%o match specified octal character (eg \%o040) | |
| 570 |/\%u| \%u \%u match specified multibyte character (eg \%u20ac) | |
| 571 |/\%U| \%U \%U match specified large multibyte character (eg | |
| 572 \%U12345678) | |
| 5901 | 573 |/\%C| \%C \%C match any composing characters |
| 7 | 574 |
| 575 Example matches ~ | |
| 576 \<\I\i* or | |
| 577 \<\h\w* | |
| 578 \<[a-zA-Z_][a-zA-Z0-9_]* | |
| 579 An identifier (e.g., in a C program). | |
| 580 | |
| 581 \(\.$\|\. \) A period followed by <EOL> or a space. | |
| 582 | |
| 583 [.!?][])"']*\($\|[ ]\) A search pattern that finds the end of a sentence, | |
| 584 with almost the same definition as the ")" command. | |
| 585 | |
| 586 cat\Z Both "cat" and "càt" ("a" followed by 0x0300) | |
| 587 Does not match "càt" (character 0x00e0), even | |
| 588 though it may look the same. | |
| 589 | |
| 590 | |
| 591 ============================================================================== | |
| 592 5. Multi items *pattern-multi-items* | |
| 593 | |
| 594 An atom can be followed by an indication of how many times the atom can be | |
| 595 matched and in what way. This is called a multi. See |/multi| for an | |
| 596 overview. | |
| 597 | |
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598 */star* */\star* |
| 7 | 599 * (use \* when 'magic' is not set) |
| 600 Matches 0 or more of the preceding atom, as many as possible. | |
| 601 Example 'nomagic' matches ~ | |
| 602 a* a\* "", "a", "aa", "aaa", etc. | |
| 603 .* \.\* anything, also an empty string, no end-of-line | |
| 604 \_.* \_.\* everything up to the end of the buffer | |
| 605 \_.*END \_.\*END everything up to and including the last "END" | |
| 606 in the buffer | |
| 607 | |
| 608 Exception: When "*" is used at the start of the pattern or just after | |
| 609 "^" it matches the star character. | |
| 610 | |
| 611 Be aware that repeating "\_." can match a lot of text and take a long | |
| 612 time. For example, "\_.*END" matches all text from the current | |
| 613 position to the last occurrence of "END" in the file. Since the "*" | |
| 614 will match as many as possible, this first skips over all lines until | |
| 615 the end of the file and then tries matching "END", backing up one | |
| 616 character at a time. | |
| 617 | |
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618 */\+* |
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619 \+ Matches 1 or more of the preceding atom, as many as possible. |
| 7 | 620 Example matches ~ |
| 621 ^.\+$ any non-empty line | |
| 622 \s\+ white space of at least one character | |
| 623 | |
| 624 */\=* | |
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625 \= Matches 0 or 1 of the preceding atom, as many as possible. |
| 7 | 626 Example matches ~ |
| 627 foo\= "fo" and "foo" | |
| 628 | |
| 629 */\?* | |
| 630 \? Just like \=. Cannot be used when searching backwards with the "?" | |
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631 command. |
| 7 | 632 |
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633 */\{* *E60* *E554* *E870* |
| 7 | 634 \{n,m} Matches n to m of the preceding atom, as many as possible |
| 635 \{n} Matches n of the preceding atom | |
| 636 \{n,} Matches at least n of the preceding atom, as many as possible | |
| 637 \{,m} Matches 0 to m of the preceding atom, as many as possible | |
| 638 \{} Matches 0 or more of the preceding atom, as many as possible (like *) | |
| 639 */\{-* | |
| 640 \{-n,m} matches n to m of the preceding atom, as few as possible | |
| 641 \{-n} matches n of the preceding atom | |
| 642 \{-n,} matches at least n of the preceding atom, as few as possible | |
| 643 \{-,m} matches 0 to m of the preceding atom, as few as possible | |
| 644 \{-} matches 0 or more of the preceding atom, as few as possible | |
| 645 | |
| 168 | 646 n and m are positive decimal numbers or zero |
| 1125 | 647 *non-greedy* |
| 7 | 648 If a "-" appears immediately after the "{", then a shortest match |
| 649 first algorithm is used (see example below). In particular, "\{-}" is | |
| 650 the same as "*" but uses the shortest match first algorithm. BUT: A | |
| 651 match that starts earlier is preferred over a shorter match: "a\{-}b" | |
| 652 matches "aaab" in "xaaab". | |
| 653 | |
| 654 Example matches ~ | |
| 655 ab\{2,3}c "abbc" or "abbbc" | |
| 1620 | 656 a\{5} "aaaaa" |
| 657 ab\{2,}c "abbc", "abbbc", "abbbbc", etc. | |
| 658 ab\{,3}c "ac", "abc", "abbc" or "abbbc" | |
| 7 | 659 a[bc]\{3}d "abbbd", "abbcd", "acbcd", "acccd", etc. |
| 660 a\(bc\)\{1,2}d "abcd" or "abcbcd" | |
| 661 a[bc]\{-}[cd] "abc" in "abcd" | |
| 662 a[bc]*[cd] "abcd" in "abcd" | |
| 663 | |
| 664 The } may optionally be preceded with a backslash: \{n,m\}. | |
| 665 | |
| 666 */\@=* | |
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667 \@= Matches the preceding atom with zero width. |
| 7 | 668 Like "(?=pattern)" in Perl. |
| 669 Example matches ~ | |
| 670 foo\(bar\)\@= "foo" in "foobar" | |
| 671 foo\(bar\)\@=foo nothing | |
| 672 */zero-width* | |
| 673 When using "\@=" (or "^", "$", "\<", "\>") no characters are included | |
| 674 in the match. These items are only used to check if a match can be | |
| 675 made. This can be tricky, because a match with following items will | |
| 676 be done in the same position. The last example above will not match | |
| 677 "foobarfoo", because it tries match "foo" in the same position where | |
| 678 "bar" matched. | |
| 679 | |
| 680 Note that using "\&" works the same as using "\@=": "foo\&.." is the | |
| 681 same as "\(foo\)\@=..". But using "\&" is easier, you don't need the | |
| 23164 | 682 parentheses. |
| 7 | 683 |
| 684 | |
| 685 */\@!* | |
| 686 \@! Matches with zero width if the preceding atom does NOT match at the | |
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687 current position. |/zero-width| |
| 3513 | 688 Like "(?!pattern)" in Perl. |
| 7 | 689 Example matches ~ |
| 690 foo\(bar\)\@! any "foo" not followed by "bar" | |
| 3513 | 691 a.\{-}p\@! "a", "ap", "app", "appp", etc. not immediately |
| 2908 | 692 followed by a "p" |
| 7 | 693 if \(\(then\)\@!.\)*$ "if " not followed by "then" |
| 694 | |
| 695 Using "\@!" is tricky, because there are many places where a pattern | |
| 696 does not match. "a.*p\@!" will match from an "a" to the end of the | |
| 697 line, because ".*" can match all characters in the line and the "p" | |
| 698 doesn't match at the end of the line. "a.\{-}p\@!" will match any | |
| 3513 | 699 "a", "ap", "app", etc. that isn't followed by a "p", because the "." |
| 7 | 700 can match a "p" and "p\@!" doesn't match after that. |
| 701 | |
| 702 You can't use "\@!" to look for a non-match before the matching | |
| 703 position: "\(foo\)\@!bar" will match "bar" in "foobar", because at the | |
| 704 position where "bar" matches, "foo" does not match. To avoid matching | |
| 705 "foobar" you could use "\(foo\)\@!...bar", but that doesn't match a | |
| 237 | 706 bar at the start of a line. Use "\(foo\)\@<!bar". |
| 7 | 707 |
| 2788 | 708 Useful example: to find "foo" in a line that does not contain "bar": > |
| 709 /^\%(.*bar\)\@!.*\zsfoo | |
| 710 < This pattern first checks that there is not a single position in the | |
| 711 line where "bar" matches. If ".*bar" matches somewhere the \@! will | |
| 712 reject the pattern. When there is no match any "foo" will be found. | |
| 713 The "\zs" is to have the match start just before "foo". | |
| 714 | |
| 7 | 715 */\@<=* |
| 716 \@<= Matches with zero width if the preceding atom matches just before what | |
|
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717 follows. |/zero-width| |
| 3513 | 718 Like "(?<=pattern)" in Perl, but Vim allows non-fixed-width patterns. |
| 7 | 719 Example matches ~ |
| 720 \(an\_s\+\)\@<=file "file" after "an" and white space or an | |
| 721 end-of-line | |
| 722 For speed it's often much better to avoid this multi. Try using "\zs" | |
| 723 instead |/\zs|. To match the same as the above example: | |
| 724 an\_s\+\zsfile | |
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725 At least set a limit for the look-behind, see below. |
| 7 | 726 |
| 727 "\@<=" and "\@<!" check for matches just before what follows. | |
| 728 Theoretically these matches could start anywhere before this position. | |
| 729 But to limit the time needed, only the line where what follows matches | |
| 730 is searched, and one line before that (if there is one). This should | |
| 731 be sufficient to match most things and not be too slow. | |
| 6153 | 732 |
| 733 In the old regexp engine the part of the pattern after "\@<=" and | |
| 734 "\@<!" are checked for a match first, thus things like "\1" don't work | |
| 735 to reference \(\) inside the preceding atom. It does work the other | |
| 736 way around: | |
| 737 Bad example matches ~ | |
| 738 \%#=1\1\@<=,\([a-z]\+\) ",abc" in "abc,abc" | |
| 739 | |
| 740 However, the new regexp engine works differently, it is better to not | |
| 741 rely on this behavior, do not use \@<= if it can be avoided: | |
| 742 Example matches ~ | |
| 743 \([a-z]\+\)\zs,\1 ",abc" in "abc,abc" | |
| 7 | 744 |
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745 \@123<= |
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746 Like "\@<=" but only look back 123 bytes. This avoids trying lots |
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747 of matches that are known to fail and make executing the pattern very |
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748 slow. Example, check if there is a "<" just before "span": |
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749 /<\@1<=span |
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750 This will try matching "<" only one byte before "span", which is the |
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751 only place that works anyway. |
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752 After crossing a line boundary, the limit is relative to the end of |
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753 the line. Thus the characters at the start of the line with the match |
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754 are not counted (this is just to keep it simple). |
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755 The number zero is the same as no limit. |
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756 |
| 7 | 757 */\@<!* |
| 758 \@<! Matches with zero width if the preceding atom does NOT match just | |
| 759 before what follows. Thus this matches if there is no position in the | |
| 760 current or previous line where the atom matches such that it ends just | |
|
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761 before what follows. |/zero-width| |
| 3513 | 762 Like "(?<!pattern)" in Perl, but Vim allows non-fixed-width patterns. |
| 7 | 763 The match with the preceding atom is made to end just before the match |
| 764 with what follows, thus an atom that ends in ".*" will work. | |
| 765 Warning: This can be slow (because many positions need to be checked | |
|
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766 for a match). Use a limit if you can, see below. |
| 7 | 767 Example matches ~ |
| 768 \(foo\)\@<!bar any "bar" that's not in "foobar" | |
| 1620 | 769 \(\/\/.*\)\@<!in "in" which is not after "//" |
| 7 | 770 |
|
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771 \@123<! |
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772 Like "\@<!" but only look back 123 bytes. This avoids trying lots of |
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773 matches that are known to fail and make executing the pattern very |
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774 slow. |
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775 |
| 7 | 776 */\@>* |
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777 \@> Matches the preceding atom like matching a whole pattern. |
| 1620 | 778 Like "(?>pattern)" in Perl. |
| 7 | 779 Example matches ~ |
| 780 \(a*\)\@>a nothing (the "a*" takes all the "a"'s, there can't be | |
| 781 another one following) | |
| 782 | |
| 783 This matches the preceding atom as if it was a pattern by itself. If | |
| 784 it doesn't match, there is no retry with shorter sub-matches or | |
| 785 anything. Observe this difference: "a*b" and "a*ab" both match | |
| 786 "aaab", but in the second case the "a*" matches only the first two | |
| 787 "a"s. "\(a*\)\@>ab" will not match "aaab", because the "a*" matches | |
| 788 the "aaa" (as many "a"s as possible), thus the "ab" can't match. | |
| 789 | |
| 790 | |
| 791 ============================================================================== | |
| 792 6. Ordinary atoms *pattern-atoms* | |
| 793 | |
| 794 An ordinary atom can be: | |
| 795 | |
| 796 */^* | |
| 797 ^ At beginning of pattern or after "\|", "\(", "\%(" or "\n": matches | |
| 798 start-of-line; at other positions, matches literal '^'. |/zero-width| | |
| 799 Example matches ~ | |
| 800 ^beep( the start of the C function "beep" (probably). | |
| 801 | |
| 802 */\^* | |
| 22171 | 803 \^ Matches literal '^'. Can be used at any position in the pattern, but |
| 804 not inside []. | |
| 7 | 805 |
| 806 */\_^* | |
| 807 \_^ Matches start-of-line. |/zero-width| Can be used at any position in | |
| 22171 | 808 the pattern, but not inside []. |
| 7 | 809 Example matches ~ |
| 810 \_s*\_^foo white space and blank lines and then "foo" at | |
| 811 start-of-line | |
| 812 | |
| 813 */$* | |
| 1620 | 814 $ At end of pattern or in front of "\|", "\)" or "\n" ('magic' on): |
| 7 | 815 matches end-of-line <EOL>; at other positions, matches literal '$'. |
| 816 |/zero-width| | |
| 817 | |
| 818 */\$* | |
| 22171 | 819 \$ Matches literal '$'. Can be used at any position in the pattern, but |
| 820 not inside []. | |
| 7 | 821 |
| 822 */\_$* | |
| 823 \_$ Matches end-of-line. |/zero-width| Can be used at any position in the | |
| 22171 | 824 pattern, but not inside []. Note that "a\_$b" never matches, since |
| 825 "b" cannot match an end-of-line. Use "a\nb" instead |/\n|. | |
| 7 | 826 Example matches ~ |
| 827 foo\_$\_s* "foo" at end-of-line and following white space and | |
| 828 blank lines | |
| 829 | |
| 830 . (with 'nomagic': \.) */.* */\.* | |
| 831 Matches any single character, but not an end-of-line. | |
| 832 | |
| 833 */\_.* | |
| 834 \_. Matches any single character or end-of-line. | |
| 835 Careful: "\_.*" matches all text to the end of the buffer! | |
| 836 | |
| 837 */\<* | |
| 838 \< Matches the beginning of a word: The next char is the first char of a | |
| 839 word. The 'iskeyword' option specifies what is a word character. | |
| 840 |/zero-width| | |
| 841 | |
| 842 */\>* | |
| 843 \> Matches the end of a word: The previous char is the last char of a | |
| 237 | 844 word. The 'iskeyword' option specifies what is a word character. |
| 7 | 845 |/zero-width| |
| 846 | |
| 847 */\zs* | |
| 22171 | 848 \zs Matches at any position, but not inside [], and sets the start of the |
| 849 match there: The next char is the first char of the whole match. | |
| 850 |/zero-width| | |
| 7 | 851 Example: > |
| 852 /^\s*\zsif | |
| 853 < matches an "if" at the start of a line, ignoring white space. | |
| 854 Can be used multiple times, the last one encountered in a matching | |
| 237 | 855 branch is used. Example: > |
| 7 | 856 /\(.\{-}\zsFab\)\{3} |
| 857 < Finds the third occurrence of "Fab". | |
| 6180 | 858 This cannot be followed by a multi. *E888* |
|
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859 {not available when compiled without the |+syntax| feature} |
| 7 | 860 */\ze* |
| 22171 | 861 \ze Matches at any position, but not inside [], and sets the end of the |
| 862 match there: The previous char is the last char of the whole match. | |
| 863 |/zero-width| | |
| 7 | 864 Can be used multiple times, the last one encountered in a matching |
| 865 branch is used. | |
| 866 Example: "end\ze\(if\|for\)" matches the "end" in "endif" and | |
| 867 "endfor". | |
| 6213 | 868 This cannot be followed by a multi. |E888| |
|
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869 {not available when compiled without the |+syntax| feature} |
| 7 | 870 |
| 871 */\%^* *start-of-file* | |
| 872 \%^ Matches start of the file. When matching with a string, matches the | |
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873 start of the string. |
| 7 | 874 For example, to find the first "VIM" in a file: > |
| 875 /\%^\_.\{-}\zsVIM | |
| 876 < | |
| 877 */\%$* *end-of-file* | |
| 878 \%$ Matches end of the file. When matching with a string, matches the | |
|
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879 end of the string. |
| 7 | 880 Note that this does NOT find the last "VIM" in a file: > |
| 881 /VIM\_.\{-}\%$ | |
| 882 < It will find the next VIM, because the part after it will always | |
| 883 match. This one will find the last "VIM" in the file: > | |
| 884 /VIM\ze\(\(VIM\)\@!\_.\)*\%$ | |
| 885 < This uses |/\@!| to ascertain that "VIM" does NOT match in any | |
| 886 position after the first "VIM". | |
| 887 Searching from the end of the file backwards is easier! | |
| 888 | |
| 640 | 889 */\%V* |
| 890 \%V Match inside the Visual area. When Visual mode has already been | |
| 891 stopped match in the area that |gv| would reselect. | |
|
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892 This is a |/zero-width| match. To make sure the whole pattern is |
| 11062 | 893 inside the Visual area put it at the start and just before the end of |
| 894 the pattern, e.g.: > | |
| 895 /\%Vfoo.*ba\%Vr | |
| 11160 | 896 < This also works if only "foo bar" was Visually selected. This: > |
| 897 /\%Vfoo.*bar\%V | |
| 11062 | 898 < would match "foo bar" if the Visual selection continues after the "r". |
| 899 Only works for the current buffer. | |
| 640 | 900 |
| 7 | 901 */\%#* *cursor-position* |
| 902 \%# Matches with the cursor position. Only works when matching in a | |
|
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903 buffer displayed in a window. |
| 7 | 904 WARNING: When the cursor is moved after the pattern was used, the |
| 905 result becomes invalid. Vim doesn't automatically update the matches. | |
| 906 This is especially relevant for syntax highlighting and 'hlsearch'. | |
| 907 In other words: When the cursor moves the display isn't updated for | |
| 908 this change. An update is done for lines which are changed (the whole | |
| 909 line is updated) or when using the |CTRL-L| command (the whole screen | |
| 910 is updated). Example, to highlight the word under the cursor: > | |
| 911 /\k*\%#\k* | |
| 912 < When 'hlsearch' is set and you move the cursor around and make changes | |
| 913 this will clearly show when the match is updated or not. | |
| 914 | |
| 640 | 915 */\%'m* */\%<'m* */\%>'m* |
| 916 \%'m Matches with the position of mark m. | |
| 917 \%<'m Matches before the position of mark m. | |
| 918 \%>'m Matches after the position of mark m. | |
| 919 Example, to highlight the text from mark 's to 'e: > | |
| 920 /.\%>'s.*\%<'e.. | |
| 921 < Note that two dots are required to include mark 'e in the match. That | |
| 922 is because "\%<'e" matches at the character before the 'e mark, and | |
| 923 since it's a |/zero-width| match it doesn't include that character. | |
| 924 WARNING: When the mark is moved after the pattern was used, the result | |
| 925 becomes invalid. Vim doesn't automatically update the matches. | |
| 651 | 926 Similar to moving the cursor for "\%#" |/\%#|. |
| 640 | 927 |
| 13231 | 928 */\%l* */\%>l* */\%<l* *E951* |
| 7 | 929 \%23l Matches in a specific line. |
| 625 | 930 \%<23l Matches above a specific line (lower line number). |
| 931 \%>23l Matches below a specific line (higher line number). | |
|
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932 \%.l Matches at the cursor line. |
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933 \%<.l Matches above the cursor line. |
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934 \%>.l Matches below the cursor line. |
| 25973 | 935 These six can be used to match specific lines in a buffer. The "23" |
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936 can be any line number. The first line is 1. |
| 7 | 937 WARNING: When inserting or deleting lines Vim does not automatically |
| 938 update the matches. This means Syntax highlighting quickly becomes | |
| 25402 | 939 wrong. Also when referring to the cursor position (".") and |
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940 the cursor moves the display isn't updated for this change. An update |
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941 is done when using the |CTRL-L| command (the whole screen is updated). |
| 7 | 942 Example, to highlight the line where the cursor currently is: > |
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943 :exe '/\%' . line(".") . 'l' |
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944 < Alternatively use: > |
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945 /\%.l |
| 7 | 946 < When 'hlsearch' is set and you move the cursor around and make changes |
| 947 this will clearly show when the match is updated or not. | |
| 948 | |
| 949 */\%c* */\%>c* */\%<c* | |
| 950 \%23c Matches in a specific column. | |
| 951 \%<23c Matches before a specific column. | |
| 952 \%>23c Matches after a specific column. | |
|
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953 \%.c Matches at the cursor column. |
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954 \%<.c Matches before the cursor column. |
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955 \%>.c Matches after the cursor column. |
| 25973 | 956 These six can be used to match specific columns in a buffer or string. |
| 957 The "23" can be any column number. The first column is 1. Actually, | |
| 958 the column is the byte number (thus it's not exactly right for | |
| 959 multibyte characters). | |
| 7 | 960 WARNING: When inserting or deleting text Vim does not automatically |
| 961 update the matches. This means Syntax highlighting quickly becomes | |
| 25402 | 962 wrong. Also when referring to the cursor position (".") and |
|
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963 the cursor moves the display isn't updated for this change. An update |
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964 is done when using the |CTRL-L| command (the whole screen is updated). |
| 7 | 965 Example, to highlight the column where the cursor currently is: > |
| 966 :exe '/\%' . col(".") . 'c' | |
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967 < Alternatively use: > |
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968 /\%.c |
| 7 | 969 < When 'hlsearch' is set and you move the cursor around and make changes |
| 970 this will clearly show when the match is updated or not. | |
| 971 Example for matching a single byte in column 44: > | |
| 972 /\%>43c.\%<46c | |
| 973 < Note that "\%<46c" matches in column 45 when the "." matches a byte in | |
| 974 column 44. | |
| 975 */\%v* */\%>v* */\%<v* | |
| 976 \%23v Matches in a specific virtual column. | |
| 977 \%<23v Matches before a specific virtual column. | |
| 978 \%>23v Matches after a specific virtual column. | |
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979 \%.v Matches at the current virtual column. |
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980 \%<.v Matches before the current virtual column. |
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981 \%>.v Matches after the current virtual column. |
| 25973 | 982 These six can be used to match specific virtual columns in a buffer or |
| 983 string. When not matching with a buffer in a window, the option | |
| 7 | 984 values of the current window are used (e.g., 'tabstop'). |
| 985 The "23" can be any column number. The first column is 1. | |
| 986 Note that some virtual column positions will never match, because they | |
| 1270 | 987 are halfway through a tab or other character that occupies more than |
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988 one screen character. |
| 7 | 989 WARNING: When inserting or deleting text Vim does not automatically |
| 283 | 990 update highlighted matches. This means Syntax highlighting quickly |
| 25402 | 991 becomes wrong. Also when referring to the cursor position (".") and |
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992 the cursor moves the display isn't updated for this change. An update |
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993 is done when using the |CTRL-L| command (the whole screen is updated). |
| 1620 | 994 Example, to highlight all the characters after virtual column 72: > |
| 7 | 995 /\%>72v.* |
| 996 < When 'hlsearch' is set and you move the cursor around and make changes | |
| 997 this will clearly show when the match is updated or not. | |
| 998 To match the text up to column 17: > | |
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999 /^.*\%17v |
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1000 < To match all characters after the current virtual column (where the |
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1001 cursor is): > |
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1002 /\%>.v.* |
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1003 < Column 17 is not included, because this is a |/zero-width| match. To |
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1004 include the column use: > |
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1005 /^.*\%17v. |
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1006 < This command does the same thing, but also matches when there is no |
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1007 character in column 17: > |
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1008 /^.*\%<18v. |
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1009 < Note that without the "^" to anchor the match in the first column, |
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1010 this will also highlight column 17: > |
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1011 /.*\%17v |
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1012 < Column 17 is highlighted by 'hlsearch' because there is another match |
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1013 where ".*" matches zero characters. |
| 25973 | 1014 |
| 7 | 1015 |
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1016 Character classes: |
| 7 | 1017 \i identifier character (see 'isident' option) */\i* |
| 1018 \I like "\i", but excluding digits */\I* | |
| 1019 \k keyword character (see 'iskeyword' option) */\k* | |
| 1020 \K like "\k", but excluding digits */\K* | |
| 1021 \f file name character (see 'isfname' option) */\f* | |
| 1022 \F like "\f", but excluding digits */\F* | |
| 1023 \p printable character (see 'isprint' option) */\p* | |
| 1024 \P like "\p", but excluding digits */\P* | |
| 1025 | |
| 21991 | 1026 NOTE: the above also work for multibyte characters. The ones below only |
| 7 | 1027 match ASCII characters, as indicated by the range. |
| 1028 | |
| 1029 *whitespace* *white-space* | |
| 1030 \s whitespace character: <Space> and <Tab> */\s* | |
| 1031 \S non-whitespace character; opposite of \s */\S* | |
| 1032 \d digit: [0-9] */\d* | |
| 1033 \D non-digit: [^0-9] */\D* | |
| 1034 \x hex digit: [0-9A-Fa-f] */\x* | |
| 1035 \X non-hex digit: [^0-9A-Fa-f] */\X* | |
| 1036 \o octal digit: [0-7] */\o* | |
| 1037 \O non-octal digit: [^0-7] */\O* | |
| 1038 \w word character: [0-9A-Za-z_] */\w* | |
| 1039 \W non-word character: [^0-9A-Za-z_] */\W* | |
| 1040 \h head of word character: [A-Za-z_] */\h* | |
| 1041 \H non-head of word character: [^A-Za-z_] */\H* | |
| 1042 \a alphabetic character: [A-Za-z] */\a* | |
| 1043 \A non-alphabetic character: [^A-Za-z] */\A* | |
| 1044 \l lowercase character: [a-z] */\l* | |
| 1045 \L non-lowercase character: [^a-z] */\L* | |
| 1046 \u uppercase character: [A-Z] */\u* | |
| 3224 | 1047 \U non-uppercase character: [^A-Z] */\U* |
| 7 | 1048 |
| 1049 NOTE: Using the atom is faster than the [] form. | |
| 1050 | |
| 1051 NOTE: 'ignorecase', "\c" and "\C" are not used by character classes. | |
| 1052 | |
| 1053 */\_* *E63* */\_i* */\_I* */\_k* */\_K* */\_f* */\_F* | |
| 1054 */\_p* */\_P* */\_s* */\_S* */\_d* */\_D* */\_x* */\_X* | |
| 1055 */\_o* */\_O* */\_w* */\_W* */\_h* */\_H* */\_a* */\_A* | |
| 1056 */\_l* */\_L* */\_u* */\_U* | |
| 1057 \_x Where "x" is any of the characters above: The character class with | |
| 1058 end-of-line added | |
| 1059 (end of character classes) | |
| 1060 | |
| 1061 \e matches <Esc> */\e* | |
| 1062 \t matches <Tab> */\t* | |
| 1063 \r matches <CR> */\r* | |
| 1064 \b matches <BS> */\b* | |
| 1065 \n matches an end-of-line */\n* | |
| 1066 When matching in a string instead of buffer text a literal newline | |
| 1067 character is matched. | |
| 1068 | |
| 1069 ~ matches the last given substitute string */~* */\~* | |
| 1070 | |
| 1071 \(\) A pattern enclosed by escaped parentheses. */\(* */\(\)* */\)* | |
| 4444 | 1072 E.g., "\(^a\)" matches 'a' at the start of a line. |
| 1073 *E51* *E54* *E55* *E872* *E873* | |
| 7 | 1074 |
| 1075 \1 Matches the same string that was matched by */\1* *E65* | |
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1076 the first sub-expression in \( and \). |
| 7 | 1077 Example: "\([a-z]\).\1" matches "ata", "ehe", "tot", etc. |
| 1078 \2 Like "\1", but uses second sub-expression, */\2* | |
| 1079 ... */\3* | |
| 1080 \9 Like "\1", but uses ninth sub-expression. */\9* | |
| 1081 Note: The numbering of groups is done based on which "\(" comes first | |
| 1082 in the pattern (going left to right), NOT based on what is matched | |
| 1083 first. | |
| 1084 | |
| 1085 \%(\) A pattern enclosed by escaped parentheses. */\%(\)* */\%(* *E53* | |
| 1086 Just like \(\), but without counting it as a sub-expression. This | |
| 1087 allows using more groups and it's a little bit faster. | |
| 1088 | |
| 1089 x A single character, with no special meaning, matches itself | |
| 1090 | |
| 1091 */\* */\\* | |
| 1092 \x A backslash followed by a single character, with no special meaning, | |
| 1093 is reserved for future expansions | |
| 1094 | |
| 1095 [] (with 'nomagic': \[]) */[]* */\[]* */\_[]* */collection* | |
| 1096 \_[] | |
| 23164 | 1097 A collection. This is a sequence of characters enclosed in square |
| 1098 brackets. It matches any single character in the collection. | |
| 7 | 1099 Example matches ~ |
| 1100 [xyz] any 'x', 'y' or 'z' | |
| 1101 [a-zA-Z]$ any alphabetic character at the end of a line | |
| 1102 \c[a-z]$ same | |
| 4073 | 1103 [А-яЁё] Russian alphabet (with utf-8 and cp1251) |
| 1104 | |
| 1125 | 1105 */[\n]* |
| 7 | 1106 With "\_" prepended the collection also includes the end-of-line. |
| 1107 The same can be done by including "\n" in the collection. The | |
| 1108 end-of-line is also matched when the collection starts with "^"! Thus | |
| 1109 "\_[^ab]" matches the end-of-line and any character but "a" and "b". | |
| 1110 This makes it Vi compatible: Without the "\_" or "\n" the collection | |
| 1111 does not match an end-of-line. | |
| 484 | 1112 *E769* |
| 481 | 1113 When the ']' is not there Vim will not give an error message but |
| 484 | 1114 assume no collection is used. Useful to search for '['. However, you |
| 6697 | 1115 do get E769 for internal searching. And be aware that in a |
| 1116 `:substitute` command the whole command becomes the pattern. E.g. | |
| 1117 ":s/[/x/" searches for "[/x" and replaces it with nothing. It does | |
| 1118 not search for "[" and replaces it with "x"! | |
| 481 | 1119 |
| 11518 | 1120 *E944* *E945* |
| 7 | 1121 If the sequence begins with "^", it matches any single character NOT |
| 1122 in the collection: "[^xyz]" matches anything but 'x', 'y' and 'z'. | |
| 1123 - If two characters in the sequence are separated by '-', this is | |
| 1124 shorthand for the full list of ASCII characters between them. E.g., | |
| 11518 | 1125 "[0-9]" matches any decimal digit. If the starting character exceeds |
| 1126 the ending character, e.g. [c-a], E944 occurs. Non-ASCII characters | |
| 1127 can be used, but the character values must not be more than 256 apart | |
| 1128 in the old regexp engine. For example, searching by [\u3000-\u4000] | |
| 1129 after setting re=1 emits a E945 error. Prepending \%#=2 will fix it. | |
| 7 | 1130 - A character class expression is evaluated to the set of characters |
| 1131 belonging to that character class. The following character classes | |
| 1132 are supported: | |
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1133 Name Func Contents ~ |
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1134 *[:alnum:]* [:alnum:] isalnum ASCII letters and digits |
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1135 *[:alpha:]* [:alpha:] isalpha ASCII letters |
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1136 *[:blank:]* [:blank:] space and tab |
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1137 *[:cntrl:]* [:cntrl:] iscntrl ASCII control characters |
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1138 *[:digit:]* [:digit:] decimal digits '0' to '9' |
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1139 *[:graph:]* [:graph:] isgraph ASCII printable characters excluding |
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1140 space |
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1141 *[:lower:]* [:lower:] (1) lowercase letters (all letters when |
| 7 | 1142 'ignorecase' is used) |
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1143 *[:print:]* [:print:] (2) printable characters including space |
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1144 *[:punct:]* [:punct:] ispunct ASCII punctuation characters |
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1145 *[:space:]* [:space:] whitespace characters: space, tab, CR, |
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1146 NL, vertical tab, form feed |
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1147 *[:upper:]* [:upper:] (3) uppercase letters (all letters when |
| 7 | 1148 'ignorecase' is used) |
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1149 *[:xdigit:]* [:xdigit:] hexadecimal digits: 0-9, a-f, A-F |
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1150 *[:return:]* [:return:] the <CR> character |
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1151 *[:tab:]* [:tab:] the <Tab> character |
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1152 *[:escape:]* [:escape:] the <Esc> character |
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1153 *[:backspace:]* [:backspace:] the <BS> character |
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1154 *[:ident:]* [:ident:] identifier character (same as "\i") |
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1155 *[:keyword:]* [:keyword:] keyword character (same as "\k") |
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1156 *[:fname:]* [:fname:] file name character (same as "\f") |
| 23164 | 1157 The square brackets in character class expressions are additional to |
| 1158 the square brackets delimiting a collection. For example, the | |
| 1159 following is a plausible pattern for a UNIX filename: | |
| 1160 "[-./[:alnum:]_~]\+". That is, a list of at least one character, | |
| 1161 each of which is either '-', '.', '/', alphabetic, numeric, '_' or | |
| 1162 '~'. | |
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1163 These items only work for 8-bit characters, except [:lower:] and |
| 21991 | 1164 [:upper:] also work for multibyte characters when using the new |
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1165 regexp engine. See |two-engines|. In the future these items may |
| 21991 | 1166 work for multibyte characters. For now, to get all "alpha" |
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1167 characters you can use: [[:lower:][:upper:]]. |
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1168 |
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1169 The "Func" column shows what library function is used. The |
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1170 implementation depends on the system. Otherwise: |
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1171 (1) Uses islower() for ASCII and Vim builtin rules for other |
| 15878 | 1172 characters. |
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1173 (2) Uses Vim builtin rules |
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1174 (3) As with (1) but using isupper() |
| 168 | 1175 */[[=* *[==]* |
| 1176 - An equivalence class. This means that characters are matched that | |
| 2974 | 1177 have almost the same meaning, e.g., when ignoring accents. This |
| 1178 only works for Unicode, latin1 and latin9. The form is: | |
| 856 | 1179 [=a=] |
| 168 | 1180 */[[.* *[..]* |
| 1181 - A collation element. This currently simply accepts a single | |
| 1182 character in the form: | |
| 856 | 1183 [.a.] |
| 7 | 1184 */\]* |
| 1185 - To include a literal ']', '^', '-' or '\' in the collection, put a | |
| 1186 backslash before it: "[xyz\]]", "[\^xyz]", "[xy\-z]" and "[xyz\\]". | |
| 1187 (Note: POSIX does not support the use of a backslash this way). For | |
| 1188 ']' you can also make it the first character (following a possible | |
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1189 "^"): "[]xyz]" or "[^]xyz]". |
| 7 | 1190 For '-' you can also make it the first or last character: "[-xyz]", |
| 1191 "[^-xyz]" or "[xyz-]". For '\' you can also let it be followed by | |
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1192 any character that's not in "^]-\bdertnoUux". "[\xyz]" matches '\', |
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1193 'x', 'y' and 'z'. It's better to use "\\" though, future expansions |
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1194 may use other characters after '\'. |
| 4339 | 1195 - Omitting the trailing ] is not considered an error. "[]" works like |
| 1196 "[]]", it matches the ']' character. | |
| 7 | 1197 - The following translations are accepted when the 'l' flag is not |
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1198 included in 'cpoptions': |
| 7 | 1199 \e <Esc> |
| 1200 \t <Tab> | |
| 1201 \r <CR> (NOT end-of-line!) | |
| 1202 \b <BS> | |
| 1125 | 1203 \n line break, see above |/[\n]| |
| 24 | 1204 \d123 decimal number of character |
| 23573 | 1205 \o40 octal number of character up to 0o377 |
| 24 | 1206 \x20 hexadecimal number of character up to 0xff |
| 1207 \u20AC hex. number of multibyte character up to 0xffff | |
| 1208 \U1234 hex. number of multibyte character up to 0xffffffff | |
| 7 | 1209 NOTE: The other backslash codes mentioned above do not work inside |
| 1210 []! | |
| 1211 - Matching with a collection can be slow, because each character in | |
| 1212 the text has to be compared with each character in the collection. | |
| 1213 Use one of the other atoms above when possible. Example: "\d" is | |
|
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Christian Brabandt <cb@256bit.org>
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|
1214 much faster than "[0-9]" and matches the same characters. However, |
|
9eebe457eb3c
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|
1215 the new |NFA| regexp engine deals with this better than the old one. |
| 7 | 1216 |
| 1217 */\%[]* *E69* *E70* *E369* | |
| 24 | 1218 \%[] A sequence of optionally matched atoms. This always matches. |
| 7 | 1219 It matches as much of the list of atoms it contains as possible. Thus |
| 1220 it stops at the first atom that doesn't match. For example: > | |
| 1221 /r\%[ead] | |
| 1222 < matches "r", "re", "rea" or "read". The longest that matches is used. | |
| 1223 To match the Ex command "function", where "fu" is required and | |
| 1224 "nction" is optional, this would work: > | |
| 1225 /\<fu\%[nction]\> | |
| 1226 < The end-of-word atom "\>" is used to avoid matching "fu" in "full". | |
| 1227 It gets more complicated when the atoms are not ordinary characters. | |
| 1228 You don't often have to use it, but it is possible. Example: > | |
| 1229 /\<r\%[[eo]ad]\> | |
| 1230 < Matches the words "r", "re", "ro", "rea", "roa", "read" and "road". | |
| 1125 | 1231 There can be no \(\), \%(\) or \z(\) items inside the [] and \%[] does |
| 1232 not nest. | |
| 1620 | 1233 To include a "[" use "[[]" and for "]" use []]", e.g.,: > |
| 1234 /index\%[[[]0[]]] | |
| 1235 < matches "index" "index[", "index[0" and "index[0]". | |
|
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Make the references to features in the help more consistent. (Sylvain Hitier)
Bram Moolenaar <bram@vim.org>
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2561
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changeset
|
1236 {not available when compiled without the |+syntax| feature} |
| 7 | 1237 |
| 140 | 1238 */\%d* */\%x* */\%o* */\%u* */\%U* *E678* |
| 24 | 1239 |
| 1240 \%d123 Matches the character specified with a decimal number. Must be | |
| 1241 followed by a non-digit. | |
| 24911 | 1242 \%o40 Matches the character specified with an octal number up to 0o377. |
| 23573 | 1243 Numbers below 0o40 must be followed by a non-octal digit or a |
| 1244 non-digit. | |
| 24 | 1245 \%x2a Matches the character specified with up to two hexadecimal characters. |
| 1246 \%u20AC Matches the character specified with up to four hexadecimal | |
| 1247 characters. | |
| 1248 \%U1234abcd Matches the character specified with up to eight hexadecimal | |
| 15932 | 1249 characters, up to 0x7fffffff |
| 7 | 1250 |
| 1251 ============================================================================== | |
| 1252 7. Ignoring case in a pattern */ignorecase* | |
| 1253 | |
| 1254 If the 'ignorecase' option is on, the case of normal letters is ignored. | |
| 1255 'smartcase' can be set to ignore case when the pattern contains lowercase | |
| 1256 letters only. | |
| 1257 */\c* */\C* | |
| 1258 When "\c" appears anywhere in the pattern, the whole pattern is handled like | |
| 1259 'ignorecase' is on. The actual value of 'ignorecase' and 'smartcase' is | |
| 1260 ignored. "\C" does the opposite: Force matching case for the whole pattern. | |
| 1261 {only Vim supports \c and \C} | |
| 1262 Note that 'ignorecase', "\c" and "\C" are not used for the character classes. | |
| 1263 | |
| 1264 Examples: | |
| 1265 pattern 'ignorecase' 'smartcase' matches ~ | |
| 1266 foo off - foo | |
| 1267 foo on - foo Foo FOO | |
| 1268 Foo on off foo Foo FOO | |
| 1269 Foo on on Foo | |
| 1270 \cfoo - - foo Foo FOO | |
| 1271 foo\C - - foo | |
| 1272 | |
| 1273 Technical detail: *NL-used-for-Nul* | |
| 1274 <Nul> characters in the file are stored as <NL> in memory. In the display | |
| 1275 they are shown as "^@". The translation is done when reading and writing | |
| 1276 files. To match a <Nul> with a search pattern you can just enter CTRL-@ or | |
| 1277 "CTRL-V 000". This is probably just what you expect. Internally the | |
| 1278 character is replaced with a <NL> in the search pattern. What is unusual is | |
| 1279 that typing CTRL-V CTRL-J also inserts a <NL>, thus also searches for a <Nul> | |
|
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Bram Moolenaar <Bram@vim.org>
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16533
diff
changeset
|
1280 in the file. |
| 7 | 1281 |
| 1282 *CR-used-for-NL* | |
| 1283 When 'fileformat' is "mac", <NL> characters in the file are stored as <CR> | |
| 1698 | 1284 characters internally. In the text they are shown as "^J". Otherwise this |
| 7 | 1285 works similar to the usage of <NL> for a <Nul>. |
| 1286 | |
| 1287 When working with expression evaluation, a <NL> character in the pattern | |
| 1288 matches a <NL> in the string. The use of "\n" (backslash n) to match a <NL> | |
| 1289 doesn't work there, it only works to match text in the buffer. | |
| 1290 | |
| 21991 | 1291 *pattern-multi-byte* *pattern-multibyte* |
| 1292 Patterns will also work with multibyte characters, mostly as you would | |
| 7 | 1293 expect. But invalid bytes may cause trouble, a pattern with an invalid byte |
| 1294 will probably never match. | |
| 1295 | |
| 1296 ============================================================================== | |
| 714 | 1297 8. Composing characters *patterns-composing* |
| 1298 | |
| 1299 */\Z* | |
| 5901 | 1300 When "\Z" appears anywhere in the pattern, all composing characters are |
| 1301 ignored. Thus only the base characters need to match, the composing | |
| 1302 characters may be different and the number of composing characters may differ. | |
| 1303 Only relevant when 'encoding' is "utf-8". | |
|
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|
1304 Exception: If the pattern starts with one or more composing characters, these |
|
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|
1305 must match. |
| 5901 | 1306 */\%C* |
| 1307 Use "\%C" to skip any composing characters. For example, the pattern "a" does | |
| 1308 not match in "càt" (where the a has the composing character 0x0300), but | |
| 1309 "a\%C" does. Note that this does not match "cát" (where the á is character | |
| 1310 0xe1, it does not have a compositing character). It does match "cat" (where | |
| 1311 the a is just an a). | |
| 714 | 1312 |
| 21250 | 1313 When a composing character appears at the start of the pattern or after an |
| 714 | 1314 item that doesn't include the composing character, a match is found at any |
| 1315 character that includes this composing character. | |
| 1316 | |
| 1317 When using a dot and a composing character, this works the same as the | |
| 1318 composing character by itself, except that it doesn't matter what comes before | |
| 1319 this. | |
| 1320 | |
|
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|
1321 The order of composing characters does not matter. Also, the text may have |
|
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|
1322 more composing characters than the pattern, it still matches. But all |
|
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Bram Moolenaar <bram@vim.org>
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|
1323 composing characters in the pattern must be found in the text. |
|
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Bram Moolenaar <bram@vim.org>
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|
1324 |
|
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|
1325 Suppose B is a base character and x and y are composing characters: |
|
2eb30f341e8d
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Bram Moolenaar <bram@vim.org>
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|
1326 pattern text match ~ |
|
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Bram Moolenaar <bram@vim.org>
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|
1327 Bxy Bxy yes (perfect match) |
|
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|
1328 Bxy Byx yes (order ignored) |
|
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|
1329 Bxy By no (x missing) |
|
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Bram Moolenaar <bram@vim.org>
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diff
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|
1330 Bxy Bx no (y missing) |
| 4780 | 1331 Bx Bx yes (perfect match) |
|
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|
1332 Bx By no (x missing) |
|
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|
1333 Bx Bxy yes (extra y ignored) |
|
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|
1334 Bx Byx yes (extra y ignored) |
| 714 | 1335 |
| 1336 ============================================================================== | |
| 1337 9. Compare with Perl patterns *perl-patterns* | |
| 7 | 1338 |
| 1339 Vim's regexes are most similar to Perl's, in terms of what you can do. The | |
| 1340 difference between them is mostly just notation; here's a summary of where | |
| 1341 they differ: | |
| 1342 | |
| 1343 Capability in Vimspeak in Perlspeak ~ | |
| 1344 ---------------------------------------------------------------- | |
| 1345 force case insensitivity \c (?i) | |
| 1346 force case sensitivity \C (?-i) | |
| 714 | 1347 backref-less grouping \%(atom\) (?:atom) |
| 7 | 1348 conservative quantifiers \{-n,m} *?, +?, ??, {}? |
| 1349 0-width match atom\@= (?=atom) | |
| 1350 0-width non-match atom\@! (?!atom) | |
| 1351 0-width preceding match atom\@<= (?<=atom) | |
| 1352 0-width preceding non-match atom\@<! (?<!atom) | |
| 1353 match without retry atom\@> (?>atom) | |
| 1354 | |
| 1355 Vim and Perl handle newline characters inside a string a bit differently: | |
| 1356 | |
| 1357 In Perl, ^ and $ only match at the very beginning and end of the text, | |
| 1358 by default, but you can set the 'm' flag, which lets them match at | |
| 1359 embedded newlines as well. You can also set the 's' flag, which causes | |
| 1360 a . to match newlines as well. (Both these flags can be changed inside | |
| 1361 a pattern using the same syntax used for the i flag above, BTW.) | |
| 1362 | |
| 1363 On the other hand, Vim's ^ and $ always match at embedded newlines, and | |
| 1364 you get two separate atoms, \%^ and \%$, which only match at the very | |
| 1365 start and end of the text, respectively. Vim solves the second problem | |
| 1366 by giving you the \_ "modifier": put it in front of a . or a character | |
| 1367 class, and they will match newlines as well. | |
| 1368 | |
| 1369 Finally, these constructs are unique to Perl: | |
| 1370 - execution of arbitrary code in the regex: (?{perl code}) | |
| 1371 - conditional expressions: (?(condition)true-expr|false-expr) | |
| 1372 | |
| 1373 ...and these are unique to Vim: | |
| 1374 - changing the magic-ness of a pattern: \v \V \m \M | |
| 1375 (very useful for avoiding backslashitis) | |
| 1376 - sequence of optionally matching atoms: \%[atoms] | |
| 1377 - \& (which is to \| what "and" is to "or"; it forces several branches | |
| 1378 to match at one spot) | |
| 1379 - matching lines/columns by number: \%5l \%5c \%5v | |
| 714 | 1380 - setting the start and end of the match: \zs \ze |
| 7 | 1381 |
| 1382 ============================================================================== | |
| 714 | 1383 10. Highlighting matches *match-highlight* |
| 7 | 1384 |
| 1385 *:mat* *:match* | |
| 1386 :mat[ch] {group} /{pattern}/ | |
| 1387 Define a pattern to highlight in the current window. It will | |
| 1388 be highlighted with {group}. Example: > | |
| 1389 :highlight MyGroup ctermbg=green guibg=green | |
| 1390 :match MyGroup /TODO/ | |
| 1391 < Instead of // any character can be used to mark the start and | |
| 1392 end of the {pattern}. Watch out for using special characters, | |
| 1393 such as '"' and '|'. | |
| 699 | 1394 |
| 7 | 1395 {group} must exist at the moment this command is executed. |
| 699 | 1396 |
| 1397 The {group} highlighting still applies when a character is | |
| 1326 | 1398 to be highlighted for 'hlsearch', as the highlighting for |
| 1399 matches is given higher priority than that of 'hlsearch'. | |
| 1400 Syntax highlighting (see 'syntax') is also overruled by | |
| 1401 matches. | |
| 699 | 1402 |
| 7 | 1403 Note that highlighting the last used search pattern with |
| 1404 'hlsearch' is used in all windows, while the pattern defined | |
| 1405 with ":match" only exists in the current window. It is kept | |
| 1406 when switching to another buffer. | |
| 699 | 1407 |
| 1408 'ignorecase' does not apply, use |/\c| in the pattern to | |
| 1409 ignore case. Otherwise case is not ignored. | |
| 1410 | |
| 1620 | 1411 'redrawtime' defines the maximum time searched for pattern |
| 1412 matches. | |
| 1413 | |
| 1125 | 1414 When matching end-of-line and Vim redraws only part of the |
| 1415 display you may get unexpected results. That is because Vim | |
| 1416 looks for a match in the line where redrawing starts. | |
| 1417 | |
| 1620 | 1418 Also see |matcharg()| and |getmatches()|. The former returns |
| 1326 | 1419 the highlight group and pattern of a previous |:match| |
| 1420 command. The latter returns a list with highlight groups and | |
| 1421 patterns defined by both |matchadd()| and |:match|. | |
| 1422 | |
| 1423 Highlighting matches using |:match| are limited to three | |
| 5968 | 1424 matches (aside from |:match|, |:2match| and |:3match| are |
| 1326 | 1425 available). |matchadd()| does not have this limitation and in |
| 1426 addition makes it possible to prioritize matches. | |
| 819 | 1427 |
| 7 | 1428 Another example, which highlights all characters in virtual |
| 1429 column 72 and more: > | |
| 1430 :highlight rightMargin term=bold ctermfg=blue guifg=blue | |
| 1431 :match rightMargin /.\%>72v/ | |
| 1432 < To highlight all character that are in virtual column 7: > | |
| 1433 :highlight col8 ctermbg=grey guibg=grey | |
| 1434 :match col8 /\%<8v.\%>7v/ | |
| 1435 < Note the use of two items to also match a character that | |
| 1436 occupies more than one virtual column, such as a TAB. | |
| 1437 | |
| 1438 :mat[ch] | |
| 1439 :mat[ch] none | |
| 1440 Clear a previously defined match pattern. | |
| 1441 | |
| 699 | 1442 |
| 819 | 1443 :2mat[ch] {group} /{pattern}/ *:2match* |
| 699 | 1444 :2mat[ch] |
| 1445 :2mat[ch] none | |
| 819 | 1446 :3mat[ch] {group} /{pattern}/ *:3match* |
| 699 | 1447 :3mat[ch] |
| 1448 :3mat[ch] none | |
| 1449 Just like |:match| above, but set a separate match. Thus | |
| 1450 there can be three matches active at the same time. The match | |
| 1451 with the lowest number has priority if several match at the | |
| 1452 same position. | |
| 1453 The ":3match" command is used by the |matchparen| plugin. You | |
| 1454 are suggested to use ":match" for manual matching and | |
| 1455 ":2match" for another plugin. | |
| 1456 | |
| 24636 | 1457 ============================================================================== |
| 1458 11. Fuzzy matching *fuzzy-match* | |
| 1459 | |
| 1460 Fuzzy matching refers to matching strings using a non-exact search string. | |
| 1461 Fuzzy matching will match a string, if all the characters in the search string | |
| 1462 are present anywhere in the string in the same order. Case is ignored. In a | |
| 1463 matched string, other characters can be present between two consecutive | |
| 1464 characters in the search string. If the search string has multiple words, then | |
| 1465 each word is matched separately. So the words in the search string can be | |
| 1466 present in any order in a string. | |
| 1467 | |
| 1468 Fuzzy matching assigns a score for each matched string based on the following | |
| 1469 criteria: | |
| 1470 - The number of sequentially matching characters. | |
| 1471 - The number of characters (distance) between two consecutive matching | |
| 1472 characters. | |
| 1473 - Matches at the beginning of a word | |
| 25402 | 1474 - Matches at a camel case character (e.g. Case in CamelCase) |
| 1475 - Matches after a path separator or a hyphen. | |
| 24636 | 1476 - The number of unmatched characters in a string. |
| 1477 The matching string with the highest score is returned first. | |
| 1478 | |
| 1479 For example, when you search for the "get pat" string using fuzzy matching, it | |
| 1480 will match the strings "GetPattern", "PatternGet", "getPattern", "patGetter", | |
| 1481 "getSomePattern", "MatchpatternGet" etc. | |
| 1482 | |
| 1483 The functions |matchfuzzy()| and |matchfuzzypos()| can be used to fuzzy search | |
| 1484 a string in a List of strings. The matchfuzzy() function returns a List of | |
| 1485 matching strings. The matchfuzzypos() functions returns the List of matches, | |
| 1486 the matching positions and the fuzzy match scores. | |
| 1487 | |
| 1488 The "f" flag of `:vimgrep` enables fuzzy matching. | |
| 1489 | |
| 1490 | |
| 699 | 1491 |
| 14421 | 1492 vim:tw=78:ts=8:noet:ft=help:norl: |