http://msdn.microsoft.com/en-us/library/ms998267.aspx
http://msdn.microsoft.com/en-us/library/ms972966.aspx

First link provides regular expressions for email address, phone, ZIP etc.

The other link gives description about all the options possible in regular expression.

This RegEx pattern validate email with most common domain like .com, .org, .biz or .co.in

If you want to use it for domain like .museum. You need some modification in current regex pattern. Following regex pattern will do it for you. It will match for valid email domains like .museum with other valid domain up to six character long.

^([a-zA-Z0-9_\-\.]+)@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,6})$