4 * Validates an IPv4 address
5 * @author Feyd @ forums.devnetwork.net (public domain)
7 class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
11 * IPv4 regex, protected so that IPv6 can reuse it
15 public function validate($aIP, $config, $context) {
17 if (!$this->ip4) $this->_loadRegex();
19 if (preg_match('#^' . $this->ip4 . '$#s', $aIP))
29 * Lazy load function to prevent regex from being stuffed in
32 protected function _loadRegex() {
33 $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
34 $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";