Validation of Empty Fields

[eluser]xwero[/eluser]
Should the field only have a value or should it be valid. With a single checkbox it's clear but with a text input it's a bit trickier.

Code:

$rules['email'] = 'required|valid_email';
$rules['confirm_email'] = 'required[email]|valid_email';

If you enter a bad e-mail address and you only check if the field has a value the confirm_email validation doesn't need to run.