3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $txt ='<!-- [newsletter:123123] --> <html style="font-size:14px;font:inherit;vertical-align:baseline;font-family:Open Sans,sans-serif;height:100%;"> <head><meta http-eq'; preg_match('/\[newsletter:(.\d)?\]/', $txt, $matches); var_dump($matches);
Output for 4.3.0 - 7.1.0
array(0) { }