title: webapp2 python regex in routing
body: <p>I'm trying to get webapp2 to handle urls in the form:</p>
  
  <pre><code>/case/e3627
  </code></pre>
  
  <p>where 'e3627' can be any alphanumeric string</p>
  
  <p>Here is my routing arguments:</p>
  
  <pre><code>app = webapp2.WSGIApplication([(r'/case/&lt;:^\w+$&gt;', ViewCase)],
                                debug=True)
  </code></pre>
  
  <p>But I get a 404 error for my urls</p>
  
  <p>I also tried <code>&lt;:^[a-zA-Z0-9_]+$&gt;</code> for the regex but no luck</p>
  
  <p>My app works fine for regular urls for example <code>/home</code> but not for the regex</p>
  
  <p>Any ideas?</p>