title: difference between '^$' and '' in urls django
body: <p>What is the difference between the below two url patterns in django?</p>
  
  <pre><code>url(r'^$', views.indexView, name='index'),
  
  url(r'', include('registration.urls'))
  </code></pre>
  
  <p>To my understanding both  '^$' and '' refer to a empty string. What does '^$' and '' specify actually?</p>