old_contents: from django.conf.urls import url
  
  from grandchallenge.participants.views import (
      RegistrationRequestList,
      RegistrationRequestCreate,
      RegistrationRequestUpdate,
      ParticipantsList,
  )
  
  app_name = "participants"
  
  urlpatterns = [
      url(r"^$", ParticipantsList.as_view(), name="list"),
      url(
          r"^registration/$",
          RegistrationRequestList.as_view(),
          name="registration-list",
      ),
      url(
          r"^registration/create/$",
          RegistrationRequestCreate.as_view(),
          name="registration-create",
      ),
      url(
          r"^registration/(?P<pk>\d+)/update/$",
          RegistrationRequestUpdate.as_view(),
          name="registration-update",
      ),
  ]
  
new_contents: from django.urls import path
  
  from grandchallenge.participants.views import (
      RegistrationRequestList,
      RegistrationRequestCreate,
      RegistrationRequestUpdate,
      ParticipantsList,
  )
  
  app_name = "participants"
  
  urlpatterns = [
      path("", ParticipantsList.as_view(), name="list"),
      path(
          "registration/",
          RegistrationRequestList.as_view(),
          name="registration-list",
      ),
      path(
          "registration/create/",
          RegistrationRequestCreate.as_view(),
          name="registration-create",
      ),
      path(
          "registration/<int:pk>/update/",
          RegistrationRequestUpdate.as_view(),
          name="registration-update",
      ),
  ]
  
subject: Replace url with path