For JS validation on the client i use this: http://blog.tcs.de/javascript-near-perfect-email-validation--check-routine-as-string-prototype/ http://blog.tcs.de/

For JS validation on the client i use this: http://blog.tcs.de/javascript-near-perfect-email-validation--check-routine-as-string-prototype/ http://blog.tcs.de/javascript-near-perfect-email-validation-... A lot shorter and has only 3 cases that would not be detected. Enough for 99.x% of all entered emails.