patch 8.2.3883: crash when switching to other regexp engine fails Commit: https://github.com/vim/vim/commit/5937c7505f444dd896f336fa0119a93a55ebe9a2 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 24 16:46:14 2021 +0000 patch 8.2.3883: crash when switching to other regexp engine fails Problem: Crash when switching to other regexp engine fails. Solution: Check for regprog being NULL.

--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4975,6 +4975,8 @@ ex_global(exarg_T *eap)
 	    // a match on this line?
 	    match = vim_regexec_multi(&regmatch, curwin, curbuf, lnum,
 						       (colnr_T)0, NULL, NULL);
+	    if (regmatch.regprog == NULL)
+		break;  // re-compiling regprog failed
 	    if ((type == 'g' && match) || (type == 'v' && !match))
 	    {
 		ml_setmarked(lnum);