$re = '/<b><font[^>]*>(.*?)<\//m';
$str = '<div class="list-group font-12"><div class="panel panel-default"><div class="panel-heading"><h3 class="panel-title"><a href="https://kazua.net/bbs/download.php?bo_table=free&wr_id=4297amp;no=0"><span class="label label-primary pull-right view-cnt">132</span><i class="fa fa-download"></i> <b><font color=428bca>미운 우리 새끼.E97.180722.360p-NEXT.mp4.torrent</font></b> (71.2K) <span class="en font-11 text-muted"><i class="fa fa-clock-o"></i> 13시간전</span></a></h3></div>';
preg_match_all($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