old_contents: from django.conf.urls.defaults import url, patterns
  
  from urls import urlpatterns as main_patterns
  
  urlpatterns = patterns('',
      url(r'^projects/(?P<project_slug>[\w.-]+)/(?P<lang_slug>\w{2})/(?P<version_slug>[\w.-]+)/(?P<filename>.*)$',
          'core.views.subproject_serve_docs',
          name='subproject_docs_detail'
      ),
      url(r'^projects/(?P<project_slug>[\w.-]+)',
          'core.views.subproject_serve_docs',
          name='subproject_docs_detail'
      ),
      url(r'^(?P<lang_slug>\w{2})/(?P<version_slug>[\w.-]+)/(?P<filename>.*)$',
          'core.views.serve_docs',
          name='docs_detail'
      ),
      url(r'^(?P<lang_slug>\w{2})/(?P<version_slug>.*)/$',
          'core.views.serve_docs',
          {'filename': 'index.html'},
          name='docs_detail'
      ),
      url(r'^$', 'core.views.subdomain_handler'),
  )
  
  urlpatterns += main_patterns
  
new_contents: from django.conf.urls.defaults import url, patterns
  
  from urls import urlpatterns as main_patterns
  
  urlpatterns = patterns('',
      url(r'^projects/(?P<project_slug>[\w.-]+)/(?P<lang_slug>\w{2})/(?P<version_slug>[\w.-]+)/(?P<filename>.*)$',
          'core.views.subproject_serve_docs',
          name='subproject_docs_detail'
      ),
      url(r'^projects/(?P<project_slug>[\w.-]+)',
          'core.views.subproject_serve_docs',
          name='subproject_docs_detail'
      ),
      url(r'^(?P<lang_slug>\w{2})/(?P<version_slug>[\w.-]+)/(?P<filename>.*)$',
          'core.views.serve_docs',
          name='docs_detail'
      ),
      url(r'^(?P<lang_slug>\w{2})/(?P<version_slug>.*)/$',
          'core.views.serve_docs',
          {'filename': 'index.html'},
          name='docs_detail'
      ),
      url(r'^(?P<version_slug>.*)/$',
          'core.views.subdomain_handler',
          name='version_subdomain_handler'
      ),
      url(r'^$', 'core.views.subdomain_handler'),
  )
  
  urlpatterns += main_patterns
  
subject: Add verison_slug redirection back in for now.