3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $string = 'categoryparameterusedpricing_15'; preg_match("/a-z_0-9/", $string, $matches); echo $matches[0];
based on WDQ7e
Output for 5.3.0 - 7.2.0
Notice: Undefined offset: 0 in /in/2dhIG on line 6
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 0 in /in/2dhIG on line 6