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@ 2012-11-15T18:59:52Z

<?php
var_dump(preg_match('/^4\d{13}$/', '41827294031896'));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

65.15 ms | 402 KiB | 5 Q