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@ 2014-07-03T22:01:06Z

<?php
$usernameCheck = 'dani';

if (!preg_match('/[^a-z_\-0-9]/i', $usernameCheck) && strlen($usernameCheck) > 3 && strlen($usernameCheck) < 15) { echo 'ok'; } else { echo 'false';}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

42.83 ms | 402 KiB | 5 Q