From 5937c7505f444dd896f336fa0119a93a55ebe9a2 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Fri, 24 Dec 2021 16:46:14 +0000
Subject: [PATCH] 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.
---
 src/ex_cmds.c | 2 ++
 src/version.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 10c8e617c9a11..14045267da0c8 100644
--- 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);
diff --git a/src/version.c b/src/version.c
index a77aa046f346d..05b8120a98c7f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3883,
 /**/
     3882,
 /**/