javascript email validation check condition issue

Question

example,

javascript,

function validateEmail(email         


        

Answer 1

Read Stop Validating Email Addresses With Complicated Regular Expressions.

As it says, this email :

"Look at all these spaces!"@example.com

is perfectly valid.

Conclusion :

1. Don't use a complex regex to validate email. /@/ is fine to check most user errors
2. Validate by sending an email and waiting for answer

Seriously, any attempt at solving the problem with a complex regex is doomed and usually keeps being worse with fixes

Answer 2

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.