3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match('/^[\d]$/', '1', $matches); print_r ($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 )