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@ 2014-05-23T12:08:21Z

<?php

$ticket = 'skf243985hf2_387bf87';
$isValid = true;

if (empty($ticket) || '_' == $ticket || preg_match('/[^a-z0-9]+/i', $ticket)) {
            $isValid = false;
}

var_dump($isValid);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

39.27 ms | 402 KiB | 5 Q