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/* IP validity checker.
   Copyright (C) 2006, 2007 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 2, 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 USA */

#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

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