[SOLVED] Zip Codes

[phpSensei]

I am very terrible in regex, and yes i did skip that one chapter when learning php. I would like to know the best way of validating a zip code. Help is appreciate it.

[effigy]

<pre>
<?php
echo preg_match('/\A\d{5}(?:-\d{4})?\z/', '12345') ? 'Matched' : 'Did not match' ;
?>
</pre>

[phpSensei]

Thanks man.