diff --git a/ap/libc/glibc/glibc-2.23/posix/bug-regex3.c b/ap/libc/glibc/glibc-2.23/posix/bug-regex3.c
new file mode 100644
index 0000000..8431405
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/posix/bug-regex3.c
@@ -0,0 +1,44 @@
+/* Test for case handling in regex.
+   Copyright (C) 2001-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int
+main (void)
+{
+  regex_t re;
+  int n;
+
+  n = regcomp (&re, "[a-bA-B]", REG_ICASE);
+  if (n != 0)
+    {
+      char buf[500];
+      regerror (n, &re, buf, sizeof (buf));
+      printf ("regcomp failed: %s\n", buf);
+      exit (1);
+    }
+
+  regfree (&re);
+
+  return 0;
+}