1/* IP validity checker.
2   Copyright (C) 2006, 2007, 2008, 2009, 2010 Jan Rafaj
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
16
17module 'is_ip'.
18
19#pragma regex push +extended
20
21func is_ip(string ip)
22  returns number
23do
24  return ip matches '^([0-9]{1,3}\.){3}[0-9]{1,3}$'
25done
26
27#pragma regex pop
28
29