library/HTMLPurifier/AttrDef/URI/IPv4.php

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<?php

class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
{
    
    protected $ip4;
    
    public function validate($aIP, $config, $context) {
        
        if (!$this->ip4) $this->_loadRegex();
        
        if (preg_match('#^' . $this->ip4 . '$#s', $aIP))
        {
                return $aIP;
        }
        
        return false;
        
    }
    
    protected function _loadRegex() {
        $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
        $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
    }
    
}

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