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@ 2014-07-19T08:09:01Z

<?php
$uid = 'NIbW9dAJpBabSy1j5aNQdQ';
echo strlen($uid). "\n";
preg_match('(^([a-zA-Z0-9_-]{22})$)', $uid, $match);

var_dump($match);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

67.26 ms | 402 KiB | 5 Q