private static function updateIrish($string)
    {
        if ( ! self::$options['irish']) return $string;

        if (mb_ereg_match('.*?\bMac[A-Za-z]{2,}[^aciozj]\b', $string) || mb_ereg_match('.*?\bMc', $string)) {
            $string = self::updateMac($string);
        }

        return mb_ereg_replace('Macmurdo', 'MacMurdo', $string);
    }