3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'hello @tag1 111 world @tag2 @tag3 222 333'; if (preg_match('~(?<!\S)(@\S+|\d+)(?:\s+(?1))*(?=\s*$)~', $str, $m)) { echo $m[0]; }
Output for git.master, git.master_jit, rfc.property-hooks
@tag2 @tag3 222 333

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
80.93 ms | 1379 KiB | 4 Q