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@ 2013-10-08T13:04:11Z

<?php
$pattern="/^20[12345][34567890]-[01][0-9]-[0123][0-9]$/";
if(preg_match($pattern,"2013-12-10"))
{
    echo "in";
}
?>

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

38.7 ms | 402 KiB | 5 Q