public function match($input, $key, $match, $lang)
    {
        $lang = $this->custom('match', $lang);
        if ($input[$key] !== $input[$match]) {
            return preg_replace_callback('/(\:field)(.*)(\:match)/i',
            function ($m) use ($key, $match) {
                return $key.$m[2].$match;
            }, $lang);
        }
    }