InfoPath Dev

I found an excellent post here http://www.infopathdev.com/forums/t/26687.aspx that shows how to set validation on a text field such that it only allows (one or more) email addresses (separated by a comma). Like [email protected] or [email protected],[email protected] I'd like to take this a step further and only allow email addresses for a specific domain, xyz.com, but I can't figure it out. Here's the validation string ([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\s*,\s*([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3}))* How would I modify this to only allow (one or more) email addresses (separated by a comma) for xyz.com? Many thanks.

 You may have already gotten this, but wouldn't it be:

([a-zA-Z0-9_\-\.]+)@xyz.com(\s*,\s*([a-zA-Z0-9_\-\.]+)@xyz.com)* 

Yes, that worked perfectly. I was expecting something more complicated. Thank you very much!