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<?php $matches = array(); var_dump(preg_match_all('/[^a-zA-Z0-9\.-\s]+/', '[[-?)', $matches)); var_dump($matches); $matches = array(); var_dump(preg_match_all('/[^a-zA-Z0-9\.\-\s]+/', '[[-?)', $matches)); var_dump($matches);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_match_all(): Compilation failed: invalid range in character class at offset 16 in /in/N9LER on line 4 bool(false) array(0) { } int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }
Output for 7.3.12 - 7.3.33
int(2) array(1) { [0]=> array(2) { [0]=> string(1) "-" [1]=> string(1) ")" } } int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }
Output for 5.4.41 - 5.4.45, 5.5.10 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
Warning: preg_match_all(): Compilation failed: invalid range in character class at offset 15 in /in/N9LER on line 4 bool(false) array(0) { } int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.40, 5.5.0 - 5.5.9
int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } } int(2) array(1) { [0]=> array(2) { [0]=> string(2) "[[" [1]=> string(2) "?)" } }

preferences:
234.67 ms | 403 KiB | 354 Q