Below is a nice little Javascript RegularExpression to validate email addresses.

[code lang=”javascript”]
/^\[email protected][a-zA-Z_.]+?\.[a-zA-Z.]{2,3}$/
[/code]

..and to use it..

[code lang=”javascript”]
if (/^\[email protected][a-zA-Z_.]+?\.[a-zA-Z.]{2,3}$/.test(email)) alert(“Success”);
else alert(“Fail”);
[/code]