title: Validate UUID string in ruby/rails
body: <p>I am working on an API. For a better developer experience, I would like to report back to the user any easily-found issue with <code>params</code>. My code validates strings, integers, booleans, iso8601 dates, and domain specific list of values. I am looking into a way to validate if a string is a valid UUID. I am looking into possible options to do it.</p>