public static function validateZipCode($zipCode, $country) {
        switch (strtoupper($country)) {
            case 'NL':
                if (preg_match('/^[1-9]{1}[0-9]{3}[A-Z]{2}$/', $zipCode))
                    return true;
                break;
            case 'BE':
                if (preg_match('/^[1-9]{4}$/', $zipCode))
                    return true;
                break;
            case 'DE':
                if (preg_match('/^[1-9]{5}$/', $zipCode))
                    return true;
                break;
        }

        return false;
    }