original artickle:

http://www.cambiaresearch.com/c4/bf974b23-484b-41c3-b331-0bd8121d5177/Parsing-Email-Addresses-with-Regular-Expressions.aspx

            public bool TestEmailRegex(string emailAddress)

            {

//                string patternLenient = @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";

//                Regex reLenient = new Regex(patternLenient);

                  string patternStrict = @"^(([^<>()[\]\\.,;:\s@\""]+"

                        + @"(\.[^<>()[\]\\.,;:\s@\""]+)*)|(\"".+\""))@"

                        + @"((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"

                        + @"\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+"

                        + @"[a-zA-Z]{2,}))$";

                  Regex reStrict = new Regex(patternStrict);

//                      bool isLenientMatch = reLenient.IsMatch(emailAddress);

//                      return isLenientMatch;

                        bool isStrictMatch = reStrict.IsMatch(emailAddress);

                        return isStrictMatch;

            }