title: django url patterns with 2 parameters
body: <p>This is simple and obvious but I can't get it right:</p>
  
  <p>I have the following view function declared in urls.py</p>
  
  <pre><code> (r'^v1/(\d+)$', r'custom1.views.v1'),
  </code></pre>
  
  <p>originally I was passing a single parameter to the view function v1.
  I want to modify it to pass 2 parameters.  How do I declare the entry in urls.py to take two parameters?</p>