How to constraint email address

[danbjoseph]

This is also a good explanation:

Formatos para direcciones e-mail o direcciones de viviendas

My Spanish is not so bueno, but I agree with Jorge that you probably don't want to have strict constraints here. This is especially true with email addresses because the email address specification is maddening. For me, the best way to validate an email is to send an email to that address with a link inside and see if someone clicks that link. The next best way, especially if you are offline, is to make sure there is no obvious typo. So what I check is at least one non-whitespace character, fo…