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run code in 150+ php & hhvm versions
Bugs & Features
<?php $matches = array(); var_dump(preg_match_all('/[^a-zA-Z0-9.-\s]+/', '[[-?)', $matches)); var_dump($matches);
Output for 5.4.41 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Compilation failed: invalid range in character class at offset 14 in /in/WR976 on line 3 bool(false) array(0) { }
Output for hhvm-3.10.0 - 3.12.0
Warning: Compilation failed: invalid range in character class at offset 14 in /in/WR976 on line 3 bool(false) array(0) { }
Output for 4.3.0 - 5.4.40
int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }