Validating Subdomain E-mail Addresses Using Regular Expressions

I have been trying all weekend to get this right, and so far it does not validate an e-mail address with a subdomain. -- Code -- $empatt = "^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$"; if(eregi($empatt, $email)) { //do stuff } -- End Code -- From my understanding, this should allow me to validate an e-mail address like <mailto:someone@subdomain.domain.com> someone@subdomain.domain.com. Has anyone been able to come up with a regular expression that will allow php to validate an e-mail address like this? Jami Moore Owner / Designer LightSpark Digital Designs <mailto:contact@lightsparkdigital.com> contact@lightsparkdigital.com <http://www.lightsparkdigital.com/> http://www.lightsparkdigital.com/