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@ 2014-06-11T13:17:51Z

<?php
$date="2012-09-12";

if (preg_match("/^[0-9]{4}-[0-1][0-9]-[0-3][0-9]$/",$date))
    {
        echo '1';
    }else{
        echo '2';
    }

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

43.89 ms | 402 KiB | 5 Q