3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $where = 'a, b, c, d'; $patterns = "/[ ]/"; echo preg_replace($patterns, $where, '$1'); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
$1