Compare two email fields

Is it possible to check/compare if two email fields are the same or ‘equals’ ?

I am asking the user to enter their email address twice in my Form

Email Address [email* email-address akismet:author_email autocomplete:Email Address]

Confirm Email Address [email* email-address-confirm akismet:author_email autocomplete:Confirm Email Address]

[group emails-same]
Emails do not match!
[/group]

I cannot get it work work ??

Thank you ??