[johnlinvc]

Not exactly the same, since there's no UInt8 in Ruby.

    require 'sinatra'
    get %r{/hello/([^/]+)/(\d+)} do |name, age|
      "Hello, #{age} year old named #{name}!"
    end

[qaq]

I am guessing age would be a string though?

[johnlinvc]

yes, the regex part handles the validation.