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@ 2014-10-07T06:34:14Z

<?php
$content = <<<CONTENT
a
@tag
CONTENT;

$matches = array();
var_dump(preg_match('/^\A\w*@/', $content, $matches, null, 2) === 1);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

45.31 ms | 402 KiB | 5 Q