protected function escaped($url) {
        $url = trim($url);
        $url = preg_replace('~[^\\pL0-9_]+~u', '-', $url);
        $url = trim($url, "-");
        $url = iconv("utf-8", "ASCII//TRANSLIT//IGNORE", $url);
        $url = preg_replace('~[^-a-zA-Z0-9_]+~', '', $url);

        return $url;
    }