url(r'^$', 'main_view', name='libraries_main_view'),
url(r'^/$', lambda x: HttpResponseRedirect(x.path[:-1])),
url(r'^/(?P<slug>[a-zA-Z0-9_-]+)$', 'catalog_view', name='libraries_catalog_view'),
+ url(r'^/(?P<catalog_slug>[a-zA-Z0-9_-]+)/(?P<slug>[a-zA-Z0-9_-]+)$', 'library_view', name='libraries_library_view'),
)
\ No newline at end of file