3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string="s1001-sdfjh"; $matches=array(); preg_match("/^(\d{4})-/", $string, $matches); print_r($matches); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( )
Output for hhvm-3.10.0

Process exited with code 153.