old_contents: from django.conf.urls import url
  from . import views
  
  app_name = 'blog'
  urlpatterns = [
      url(r'^$', views.index, name='index'),
      url(r'^post/(?P<pk>[0-9]+)/$', views.detail, name='detail'),
      url(r'^category/(?P<slug>[a-zA-Z0-9_\-\u4e00-\u9fa5]+)/$', views.category, name='category'),
      url(r'^search/$', views.search, name='search'),
  ]
new_contents: from django.conf.urls import url
  from . import views
  
  app_name = 'blog'
  urlpatterns = [
      url(r'^$', views.index, name='index'),
      url(r'^post/(?P<pk>[0-9]+)/$', views.detail, name='detail'),
      url(r'^category/(?P<slug>[a-zA-Z0-9_\-\u4e00-\u9fa5]+)/$', views.category, name='category'),
      url(r'^tag/(?P<slug>[a-zA-Z0-9_\-\u4e00-\u9fa5]+)/$', views.tag, name='tag'),
      url(r'^search/$', views.search, name='search'),
  ]
subject: update blog.urls