How can I modify regular expression to validate domain properly?

Question

I found the following regex:

/[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/

on this site: http://www.regular-expressions.info/email.html

and it works great (matches 99.99% of actual emails), with one exception. It allows you to append anything you want after the domain.

example:

test does not match
test@domain does not match
test@domain.com does match
test@domain.co.uk does match
test@domain.comdsaf#()%@dsf,25ljsafdlfkjj&45234^\/3258afsd still matches

I also only want to validate a single email at a time, so the following string should not match, despite being valid in an email client: test@domain.com;test2@domain.com

This is being used by javascript.

Answer 1

/[a-z0-9!#$%&'*+\\/=?^_ {|}~-]+(?:.[a-z0-9!#$%&'*+/=?^_ {|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/

I just added in the dollar sign at the end, indicating that you are expecting the end of the input at that point.