title: Simple URL mapping issue
body: <p>I would like to map my urls.py to include this url: <a href="http://127.0.0.1:8000/activity/Arts%20&amp;%20Crafts/member" rel="nofollow">http://127.0.0.1:8000/activity/Arts%20&amp;%20Crafts/member</a></p>
  
  <p>This url was created by this line of code in my activity.html template:</p>
  
  <pre><code> &lt;li&gt;&lt;a href='/activity/{{ activity.name }}/member'&gt;{{ activity.name }}&lt;/a&gt;&lt;/li&gt;
  </code></pre>
  
  <p>Arts &amp; Crafts is the name of an object I've created under the model Activity:</p>
  
  <p><strong>(models.py)</strong></p>
  
  <pre><code>class Activity(models.Model):
      name = models.CharField(max_length=50)
      comments = models.CharField(max_length=300, null=True, blank=True)
      questions = models.ManyToManyField(Question, blank=True)
      pub_date = models.DateTimeField('Date published')
      def __str__(self):
          return self.name
  </code></pre>
  
  <p>Right now, my url in urls.py looks like this:</p>
  
  <pre><code>url(r'^activity/{{ models.Activity.name }}/member/$', views.SelectView.as_view(), name='select_member'),
  </code></pre>
  
  <p>But it doesn't work. When I try to go to <a href="http://127.0.0.1:8000/activity/Arts%20&amp;%20Crafts/member" rel="nofollow">http://127.0.0.1:8000/activity/Arts%20&amp;%20Crafts/member</a>; I get a 'Page Not Found' error saying "The current URL, activity/Arts &amp; Crafts/member, didn't match any of these."</p>
  
  <p>Can someone tell me what is wrong with my url, and how to fix it? Thank you.</p>
  
  <p>Extra info--
  <strong>urls.py:</strong>
  from django.conf.urls import url</p>
  
  <p>from . import views</p>
  
  <pre><code>urlpatterns = [  
      url(r'^$', views.IndexView.as_view(), name='index'),
      url(r'^detail/$', views.DetailView.as_view(), name='detail'),
      url(r'^activity/$', views.ActivityView.as_view(), name='activity'),
      url(r'^activity/{{ models.Activity.name }}/member/$', views.SelectView.as_view(), name='select_member'),
  ]
  </code></pre>
  
  <p><strong>views.py:</strong></p>
  
  <pre><code>class SelectView(generic.ListView):
    template_name = 'expcore/select_member.html'
    model = Activity
  </code></pre>