title: How can I implement multiple URL parameters in a Tornado route?
body: <p>I'm trying to figure out how to implement a URL with up to 3 (optional) url parameters.</p>
  
  <p>I figured out how to do this in ASP.NET MVC 3, but the constraints of the current project eliminated it. So, here's what I'm looking for:</p>
  
  <p><code>base/{param1}/{param2}/{param3}</code> where param2 and param3 are optional. Is this simply a regex pattern in the <code>handlers</code> section?</p>