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<?php $str = "5391898ad96363ea4f8b45ed"; $x = preg_match("~^[0-9a-f]{24}$~", $str, $z); var_dump($x,$z);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(24) "5391898ad96363ea4f8b45ed" }