3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s = '<iframe ><embed boo width=222>fdgwidth=700dfg</embed>sfsdfsdf</iframe>'; $matches = array(); var_dump( preg_replace('~(.*<[^>]+\swidth=["\']?)(\d+)(["\']?[^>]*>.*)~', '${1}---${3}', $s) );
based on USQTK
Output for 4.3.0 - 7.1.10
string(70) "<iframe ><embed boo width=--->fdgwidth=700dfg</embed>sfsdfsdf</iframe>"