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@ 2014-10-01T15:20:10Z

<?php

var_dump(preg_match('/[0-9a-fA-F]{24}/', '51eede31a3e471ac923d4b56'));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

37.93 ms | 402 KiB | 5 Q