old_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = [
      url(r'^$', views.front_page, name='front_page'),
      url(r'^engine/(?P<name>[ a-zA-Z]+)/$', views.engine_players, name='engine'),
      url(r'^engine/(?P<name>[ a-zA-Z]+)/wads/$', views.engine_wads, name='wads'),
      url(r'^engine/(?P<name>[ a-zA-Z]+)/servers/$', views.engine_servers, name='servers'),
      url(r'^about/$', views.about, name='about')
  ]
  
new_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = [
      url(r'^$', views.front_page, name='front_page'),
      url(r'^engine/(?P<name>[ a-zA-Z0-9]+)/$', views.engine_players, name='engine'),
      url(r'^engine/(?P<name>[ a-zA-Z0-9]+)/wads/$', views.engine_wads, name='wads'),
      url(r'^engine/(?P<name>[ a-zA-Z0-9]+)/servers/$', views.engine_servers, name='servers'),
      url(r'^about/$', views.about, name='about')
  ]
  
subject: Support game engines with numbers in name.