1 files changed, 16 insertions, 1 deletions

diff --git a/src/regress/lib/libc/regex/tests b/src/regress/lib/libc/regex/tests
index f400b8575b..f3fd9d0e6b 100644
--- a/src/regress/lib/libc/regex/tests
+++ b/src/regress/lib/libc/regex/tests
@@ -1,4 +1,4 @@
-#       $OpenBSD: tests,v 1.9 2020/12/28 21:41:55 millert Exp $
+#       $OpenBSD: tests,v 1.10 2021/04/02 14:20:57 otto Exp $
 #       $NetBSD: tests,v 1.5 1995/04/20 22:40:00 cgd Exp $
 
 # regular expression test set
@@ -595,3 +595,18 @@ a?b	-	ab	ab
 # FreeBSD PR 130504
 (.|())(b)       -       ab      ab
 (()|.)(b)       -       ab      ab
+
+# Some BRE cases where \{0,\} makes a backref go wrong, as reported by Michael Paoli
+Y*\(x\)\1       b       YYxx    YYxx
+Y\{2,\}\(x\)\1  b       YYxx    YYxx
+# Fails currently
+#Y\{0,\}\(x\)\1 b       YYxx    YYxx
+Y\{0,\}\(x\)    b       YYxx    YYx
+Y\{2,\}x\{1,\}  b       YYxx    YYxx
+Y\{2,\}x\{0,\}z b       YYxxz   YYxxz
+Y\{0,\}x\{0,\}z b       YYxxz   YYxxz
+Y\{2,\}\(xy\)\1 b       YYxyxy  YYxyxy
+# Fails currently
+#Y\{0,\}\(xy\)\1        b       YYxyxy  YYxyxy
+Y*\(xy\)\1      b       YYxyxy  YYxyxy
+Y\{0,\}\(xy\)xy b       YYxyxy  YYxyxy