3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $s = '$name = "foo"; My name is foo'; $r = preg_replace('/foo(?=")/', 'VARIABLE', $s); var_dump($r);
based on 1mlR7
Output for 4.3.0 - 7.1.0
string(34) "$name = "VARIABLE"; My name is foo"