protected function renderUrl($block)
{
$url = htmlspecialchars($block[1], ENT_COMPAT | ENT_HTML401, 'UTF-8');
$decodedUrl = urldecode($block[1]);
$secureUrlText = preg_match('//u', $decodedUrl) ? $decodedUrl : $block[1];
$text = htmlspecialchars($secureUrlText, ENT_NOQUOTES | ENT_SUBSTITUTE, 'UTF-8');
return "<a href=\"{$url}\">{$text}</a>";
}