3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(preg_match_all('/#(\w+)\b/', '#tag1 41654 #tag 1', $r)); var_dump($r);
Output for 5.3.7 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(2) array(2) { [0]=> array(2) { [0]=> string(5) "#tag1" [1]=> string(4) "#tag" } [1]=> array(2) { [0]=> string(4) "tag1" [1]=> string(3) "tag" } }

preferences:
208.63 ms | 405 KiB | 254 Q