Javascript Email Validation Form Using Regular Expressions Part 1 of 2
In this tutorial, I show you how to create a html form that uses javascript to check whether or not a entered email address is a valid email or not. Make sure you include a server side validation script as well if your using this on your own website, because if javascript is turned off by bots, then they can bypass the client-side (javascript) validation process
download link for tutorial files:
http://www.freetutorialsrock.com/forum/viewtopic.php?f=9&t=7
source