- url(r'^$', views.main_view, name='libraries_main_view'),
- url(r'^(?P<slug>[a-zA-Z0-9_-]+)$', views.catalog_view, name='libraries_catalog_view'),
- url(r'^(?P<catalog_slug>[a-zA-Z0-9_-]+)/(?P<slug>[a-zA-Z0-9_-]+)$', views.library_view, name='libraries_library_view'),
+ path('', views.main_view, name='libraries_main_view'),
+ path('<slug:slug>', views.catalog_view, name='libraries_catalog_view'),
+ path('<slug:catalog_slug>/<slug:slug>', views.library_view, name='libraries_library_view'),