3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $subject = "Windows2000"; $pattern = '/Windows(?=95|98|NT|2000)/'; preg_match($pattern, $subject, $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Windows )