patch 8.1.0098: segfault when pattern with z() is very slow commit https://github.com/vim/vim/commit/bcf9442307075bac40d44328c8bf7ea21857b138 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 23 14:21:42 2018 +0200 patch 8.1.0098: segfault when pattern with \z() is very slow Problem: Segfault when pattern with \z() is very slow. Solution: Check for NULL regprog. Add "nfa_fail" to test_override() to be able to test this. Fix that 'searchhl' resets called_emsg.

--- a/src/vim.h
+++ b/src/vim.h
@@ -1013,6 +1013,7 @@ extern int (*dyn_libintl_putenv)(const c
 /* values for reg_do_extmatch */
 # define REX_SET	1	/* to allow \z\(...\), */
 # define REX_USE	2	/* to allow \z\1 et al. */
+# define REX_ALL	(REX_SET | REX_USE)
 #endif
 
 /* Return values for fullpathcmp() */