3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $var = array('40_'); if (preg_match('/^(\d{1,})_$/', reset($var), $match)) { var_dump($match); }
based on VV1cq
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(3) "40_" [1]=> string(2) "40" }