/* IP validity checker.
   Copyright (C) 2006, 2007, 2008, 2009, 2010 Jan Rafaj

   This program 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 3, or (at your option)
   any later version.

   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>. */

module 'is_ip'.

#pragma regex push +extended

func is_ip(string ip)
  returns number
do
  return ip matches '^([0-9]{1,3}\.){3}[0-9]{1,3}$'
done

#pragma regex pop