3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match($r = '[foo\\[\\[[-.[:digit:][:space:]]+]', 'lorem foo[[42 37 19 ipsum', $m), $m); echo "$r\n";
based on jL5U1
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(14) "foo[[42 37 19 " } [foo\[\[[-.[:digit:][:space:]]+]