I use whatever that comes with restful_authentication scaffold generator 
and for the most part it works fine for me:
/^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i

If you want to learn more about this or more control over it, I suggest 
you read http://www.regular-expressions.info/email.html

-sunny
http://ezror.com
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