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@ 2014-10-07T06:27:43Z

<?php
$content = <<<CONTENT
This is a summary.
@tag
CONTENT;

$matches = array();
var_dump(preg_match('/^\w*@/', $content, $matches, null, 0) === 1);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

64.56 ms | 402 KiB | 5 Q