Congratulations. From this day forward, you will no longer squander your time trying to work out the perfect regex to validate email addresses. You will also never again run the risk of rejecting what is, in fact, a strange, valid email address.

The upshot
There is no point in trying to work out if an email address is ‘valid’. A user is far more likely to enter a wrong and valid email address than they are to enter an invalid one.

Therefore, you are better off spending your time doing literally any other thing than trying to validate email addresses.