Checking for valid data

[im_here]

I've written a program in perl for somebody to set up an account. I want to check the data in perl for a valid account name and a valid email address.

How would I do this?

[lexipixel]

You don't say what type of "account" it is.

Does the account give the user privledges like creating directories, web pages, have access to backend functionality, OR is this access to use a program? (ie- "You must register before being able to post" or "You must register to view wholesale catalog").

[cyberws]

Also is this script checking against a SQL style DB or a flatfile like CSV.