$re = '/title=".*(title="(.*.)">)/';
$str = '<div id="video_6003150" class="thumb-block"><div class="thumb-inside"><div class="thumb"><a href="/video6003150/pure_mature_janet_mason"><img src="https://cdn77-pic.xvideos-cdn.com/videos/thumbs169l/03/4b/22/034b224b0f77b7260aa8d6c44b49cb69/034b224b0f77b7260aa8d6c44b49cb69.5.jpg" data-idcdn="10" data-videoid="6003150" id="pic_6003150"><div class="videopv" style="display: none;"><a href="https://www.xvideos.com/video6003150/pure_mature_janet_mason"></a><div class="progress" style="display: none;"><div class="bar" style="width: 100%;"></div></div></div></a></div><button class="watch-later init-ok" title="Ver después"><span class="icon-f icf-clock"></span></button><a class="icon-f icf-check-circle icf-white-fill prof-verified-tick" title="Modelo verificada" href="/verified/videos"></a></div><div class="thumb-under"><p><a href="/video6003150/pure_mature_janet_mason" title="Pure Mature Janet Mason">Pure Mature Janet Mason</a></p><p class="metadata"><span class="bg"><span class="duration">7 min</span><a href="/channels/puremature"><span class="name">Pure Mature</span></a><span><span class="sprfluous"> - </span> 9,7M <span class="sprfluous">Vistas</span></span><span class="sprfluous"> - </span></span></p></div></div>';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php