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Regular expressions can be very useful and efficient if used properly. For a while now in some of our applications we have been using the following regular expression to check e-mail addresses for proper formatting. ^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*.(([a-z]{2,3})|(aero|coop|info|museum|name))$ This will ensure that the user has entered a properly formatted e-mail address such as user@domain.com.