Is it possible to validate a radio group (so something is checked off, or chosen) using server-side validation with Perl? If so, how?

I already have it for JavaScript, but I want this form to be able to be submitted even without JavaScript enabled. Thus I will need the validation on the server-side.

There is no fixed name for the radio group, it can change, however there must be a name, so that @names = $cgi->param() will give all the names.

I'm thinking along something that will give me the type, like the type in JavaScript, to determine if it's a radio button in a group.