Кривые ссылки в Punycode типа http://xn-- (kunena 3.0.6) - Kunena

[url=http://россия.рф/]ссылка 1[/url]
[url=http://xn--h1alffa9f.xn--p1ai/]ссылка 2[/url]

[url=http://xn--h1alffa9f.xn--p1ai/]ссылка 2[/url]

	/**
	 * @see BBCode::IsValidURL()
	 * Regular expression taken from https://gist.github.com/729294
	 */
	public function IsValidURL($string, $email_too = true, $local_too = false) {
		static $re = '_^(?:(?:https?|ftp)://)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:/[^\s]*)?$_iuS';

		if (empty($string)) return false;
		if ($local_too && $string[0] == '/') $string = 'http://www.domain.com' . $string;
		if ($email_too && substr($string, 0, 7) == "mailto:") return $this->IsValidEmail(substr($string, 7));
		if (preg_match($re, $string)) return true;
		return false;
	}