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@ 2014-06-06T11:30:55Z

<?php
$str = "5391898ad96363ea4f8b45ed";
$x = preg_match("~[0-1a-f]{24}~", $str, $z);
var_dump($x,$z);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

34.86 ms | 402 KiB | 5 Q