Fix an off-by-one error in the marking of the O_CH operator following

an OOR2 operator.  Also includes a regress test for the issue.
From FreeBSD via miod@

1 files changed, 4 insertions, 1 deletions

diff --git a/src/regress/lib/libc/regex/tests b/src/regress/lib/libc/regex/tests
index ee019f0a04..f400b8575b 100644
--- a/src/regress/lib/libc/regex/tests
+++ b/src/regress/lib/libc/regex/tests
@@ -1,4 +1,4 @@
-#       $OpenBSD: tests,v 1.8 2016/05/26 14:23:55 schwarze Exp $
+#       $OpenBSD: tests,v 1.9 2020/12/28 21:41:55 millert Exp $
 #       $NetBSD: tests,v 1.5 1995/04/20 22:40:00 cgd Exp $
 
 # regular expression test set
@@ -592,3 +592,6 @@ Char \([a-z0-9_]*\)\[.*	b	Char xyz[k	Char xyz[k	xyz
 a?b     -       ab      ab
 -\{0,1\}[0-9]*$ b       -5      -5
 
+# FreeBSD PR 130504
+(.|())(b)       -       ab      ab
+(()|.)(b)       -       ab      ab