See forum rules re homework. It is not in your interests in the long run if other people do your homework for you. This is a very, very simple assignment and if you have paid attention in class you ought to be able to do it easily.
Hint - simply count the @ signs and if result is zero or more than one then the email address is not valid.
111,111,111 x 111,111,111 = 12,345,678,987,654,321
Last edited by Philip M; 05-22-2008 at 12:39 PM..