[PATCH] tests/cond-regexp3.sub: avoid ERE UB

[Grisha Levit]

This test fails on systems with recent-ish BSD regex libs, where a
backslash followed by an alphabetic chatacter now throws REG_EESCAPE.

See https://reviews.freebsd.org/D10510
---
 tests/cond-regexp3.sub | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/cond-regexp3.sub b/tests/cond-regexp3.sub
index d939548c..bef44f8b 100644
--- a/tests/cond-regexp3.sub
+++ b/tests/cond-regexp3.sub
@@ -58,7 +58,7 @@ done
 [[ x =~ \\x ]] ; echo $?
 
 bs='\'
-[[ x =~ ${bs}x ]] ; echo $?
+[[ \[ =~ ${bs}[ ]] ; echo $?
 
 [[ x =~ $'\\'x ]] ; echo $?
 [[ x =~ '\'x ]] ; echo $?
-- 
2.45.0