Initial revision
diff --git a/bgpd/bgp_regex.c b/bgpd/bgp_regex.c
new file mode 100644
index 0000000..a6b6598
--- /dev/null
+++ b/bgpd/bgp_regex.c
@@ -0,0 +1,93 @@
+/* AS regular expression routine
+ Copyright (C) 1999 Kunihiro Ishiguro
+
+This file is part of GNU Zebra.
+
+GNU Zebra is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+GNU Zebra 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Zebra; see the file COPYING. If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "command.h"
+#include "memory.h"
+
+#include "bgpd.h"
+#include "bgp_aspath.h"
+#include "bgp_regex.h"
+
+/* Character `_' has special mean. It represents [,{}() ] and the
+ beginning of the line(^) and the end of the line ($).
+
+ (^|[,{}() ]|$) */
+
+regex_t *
+bgp_regcomp (char *regstr)
+{
+ /* Convert _ character to generic regular expression. */
+ int i, j;
+ int len;
+ int magic = 0;
+ char *magic_str;
+ char magic_regexp[] = "(^|[,{}() ]|$)";
+ int ret;
+ regex_t *regex;
+
+ len = strlen (regstr);
+ for (i = 0; i < len; i++)
+ if (regstr[i] == '_')
+ magic++;
+
+ magic_str = XMALLOC (MTYPE_TMP, len + (14 * magic) + 1);
+
+ for (i = 0, j = 0; i < len; i++)
+ {
+ if (regstr[i] == '_')
+ {
+ memcpy (magic_str + j, magic_regexp, strlen (magic_regexp));
+ j += strlen (magic_regexp);
+ }
+ else
+ magic_str[j++] = regstr[i];
+ }
+ magic_str[j] = '\0';
+
+ regex = XMALLOC (MTYPE_BGP_REGEXP, sizeof (regex_t));
+
+ ret = regcomp (regex, magic_str, REG_EXTENDED);
+
+ XFREE (MTYPE_TMP, magic_str);
+
+ if (ret != 0)
+ {
+ XFREE (MTYPE_BGP_REGEXP, regex);
+ return NULL;
+ }
+
+ return regex;
+}
+
+int
+bgp_regexec (regex_t *regex, struct aspath *aspath)
+{
+ return regexec (regex, aspath->str, 0, NULL, 0);
+}
+
+void
+bgp_regex_free (regex_t *regex)
+{
+ regfree (regex);
+ XFREE (MTYPE_BGP_REGEXP, regex);
+}