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@ 2014-05-21T15:51:01Z

<?php
$subject = "#nga.LEFT_KEY";

echo preg_match('/^#([a-z,_]*[\.]?)?([A-Z,_]+)$/', $subject);

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

35.8 ms | 402 KiB | 5 Q