javascript email validation check condition issue

Question

example,

javascript,

function validateEmail(email         


        

Answer 1

Validating client-side is pretty pointless, as users can remove or even edit it. You have to check it serverside too, or don't validate at all and just mail!

 var emailfilter = /(([a-zA-Z0-9\-?\.?]+)@(([a-zA-Z0-9\-_]+\.)+)([a-z]{2,3}))+$/;
  if(emailfilter .test(string)) { //mail

}

There is no way you can validate if an emailaddress exists without mailing and waiting for the user to click the confirmation url. You only can validate if they match patterns which an email should look like.