old_contents: from django.conf.urls import patterns, url
  
  from user_guide import views
  
  
  urlpatterns = patterns(
      '',
      url(r'/seen/', views.GuideSeenView.as_view(), name='user_guide.seen')
  )
  
new_contents: from django.conf.urls import patterns, url
  
  from user_guide import views
  
  
  urlpatterns = patterns(
      '',
      url(r'^seen/?$', views.GuideSeenView.as_view(), name='user_guide.seen')
  )
  
subject: fix urls