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@ 2013-07-10T16:10:19Z

<?php
$my_var = '123';
if(preg_match('~^[\d]+$~', $my_var))
{
     echo 'Yes!';      
}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

30.39 ms | 402 KiB | 5 Q