Obtenha o href em string regex php
$html = 'some text here<a href="http://www.mydomain.com/page.html">URL</a> some text here as well';
$url = preg_match('/<a href="(.+)">/', $html, $match);
$info = parse_url($match[1]);
echo $info['scheme'].'://'.$info['host'];
uzii