Regular Expression For Email To Allow Only Two Domain?

Dec 1, 2010

I have to create a regular expression for email id like this

xyz@yahoo.com and
xyz@gmail.com

I need to allow only yahoo and gmail as the domain not any other domain. I have used this expression w+([-+.]w+)*@yahoo.com . It is working fine for yahoo. but I want to include gmail also. How can I modify it to except gmail also?

I am using ASP.NET 2.0

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