Respect\Validation\Rules\Domain::__construct PHP Метод

    public function __construct($tldCheck = true)
    {
        $this->checks[] = new NoWhitespace();
        $this->checks[] = new Contains('.');
        $this->checks[] = new Length(3, null);
        $this->tldCheck($tldCheck);
        $this->otherParts = new AllOf(new Alnum('-'), new Not(new StartsWith('-')), new OneOf(new Not(new Contains('--')), new AllOf(new StartsWith('xn--'), new Callback(function ($str) {
            return mb_substr_count($str, '--') == 1;
        }))));
    }