$re = '/<div(.*?)<\/div>/ms';
$str = '<div class="portlet-body author-note"><p>Thanks to the massive new influx of patrons! You guys rock! (and stone!)</p>
<div class="spoiler">
<div class="smalltext"><strong>Spoiler</strong> : <input class="spoilerButton"/></div>
</div>
<div class="spoiler">
</div>
<p>R Quam<br/>
Rory<br/>
PiMs<br/>
Imi256<br/>
Thomas Belvin<br/>
Jacob<br/>
<p> </p>
<p>We are currently reaching 3 weeks </p>
</div>
</div>';
preg_match_all($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