$reg_login = '/^[a-z0-9_-]{3,16}$/';
        $reg_password = '/^[a-z0-9_-]{3,16}$/';
        //logowanie
        session_start();
        if (isset($_REQUEST['zaloguj'])) {
            $login = $_REQUEST['login'];
            $haslo = $_REQUEST['password'];

            try {
                if (filter_var($login, FILTER_VALIDATE_REGEXP, array(
                            "options" => array("regexp" => $reg_login))) &&
                        filter_var($haslo, FILTER_VALIDATE_REGEXP, array(
                            "options" => array("regexp" => $reg_password)))) {