ValidEmailAddress validation rule does not work
In the exercise 'validating user entries', the standard validation rule, ValidEmailAddress, that is shipped as part of the product must be used.
However, when testing my rule, valid e-mail addresses got rejected.
(for example, an address containing the DNS root, expressed as an empty label followed by a dot '.').
There may be good reasons to do that, but please call such a validation rule 'StandardEmailAddress' or something like that, instead of ValidEmailAddress. Or alternatively, consider adhering to the standards (RFC's).