The function is passed four arguments, two required: regex and view, and two optional: kwargs, and name.

url(r'^$', views.index, name='index'),url(r'^polls/', include('polls.urls')),url(r'^admin/', admin.site.urls),

^匹配输入字符串开始

$匹配输入字符串结束

argument: regex		https://www.example.com/myapp/?page=3,
argument: view
argument: kwargs	dictionary
argument: name	lets you refer to it unambiguously

 

常用正则表达式：