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@ 2013-07-09T22:17:57Z

<?php
$string = 'username1234_-';
preg_match('/[\w\d_-]{0,14}+/', $string, $match);
var_dump($match);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

40.89 ms | 402 KiB | 5 Q