Validating and normalzing the format of email addresses, phone numbers, etc.

[PanderMusubi]

Sometimes users make typing errors in email addresses. This add-on would be able notify when an email address is not validating to formatting rules so the user can fix this.

[DDvO]

Validating email addresses and other data is not really the job of this extension,
but I've already considered generalizing it to optionally to perform not only validation
but also normalization of various field values, i.e., conversion to standard format.

[DDvO]

I've extended the subject of this issue to reflect some more general thoughts on it.

[PanderMusubi]

Yes, normalization is better as the data is not shared with third parties.