help with Email reg ex

[freebie]

Hi,
I'm using the following as a regular expression for email validation, but I realized it doesn't work in the case where the domain is multipart (such as [e-mail] )
Here is my current regular expression:
^{[a-zA-Z0-9-]+@[a-zA-Z0-9-]+.[a-zA-Z]+$}

Can someone help me to change this to allow emails that contain subdomains in the name.

Thanks for any suggestions

[dta]

try this - it works with both

$reg="^[a-z0-9]+(\\.|_|-)?[a-z0-9]+@[a-z0-9]+\\.([a-z0-9]+\\.)?[a-z0-9]{2,4}$";
$email="[e-mail]";
echo preg_match("/$reg/i",$email);

thats the one i use sometimes