Faker\Test\Provider\UuidTest::isUuid PHP Method

    protected function isUuid($uuid)
    {
        return is_string($uuid) && (bool) preg_match('/^[a-f0-9]{8,8}-(?:[a-f0-9]{4,4}-){3,3}[a-f0-9]{12,12}$/i', $uuid);
    }