patch 8.2.3292: underscore in very magic pattern causes a hang Commit: https://github.com/vim/vim/commit/bc67e5a0a494f5fc48e872d747371e31a782d171 Author: Christian Brabandt <cb@256bit.org> Date: Thu Aug 5 15:24:59 2021 +0200 patch 8.2.3292: underscore in very magic pattern causes a hang Problem: Underscore in very magic pattern causes a hang. Pattern with \V are case sensitive. (Yutao Yuan) Solution: Adjust condition for magicness and advance pointer. (Christian Brabandt, closes #8707, closes #8704, closes #8705)

--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -1962,6 +1962,17 @@ func Test_pattern_is_uppercase_smartcase
   call assert_equal(['abc', 'ABC', 'Abc', ''],
         \ getline(1, '$'))
 
+  call setline(1, input)
+  call cursor(1,1)
+  " \Vabc should match everything
+  %s/\Vabc//g
+  call assert_equal(['', '', '', ''], getline(1, '$'))
+
+  call setline(1, input + ['_abc'])
+  " _ matches normally
+  %s/\v_.*//g
+  call assert_equal(['abc', 'ABC', 'Abc', 'abC', ''], getline(1, '$'))
+
   set smartcase& ignorecase&
   bw!
 endfunc