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@ 2015-11-11T10:53:45Z

<?php

$s = '';
for($i=0;$i<1000;$i++)
 $s .= "abcdefgh";
 
var_dump(preg_match('/[-_.0-9A-Za-z]{1,64}@[-_0-9A-Za-z]+[-_.0-9A-Za-z]+/', $s));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

38.82 ms | 402 KiB | 5 Q