Improve named regular-expression groups example to capture URL bits

[Pablo Oubiña]

Hi folks!

Documentation shows ​https://docs.djangoproject.com/en/dev/topics/http/urls/#named-groups:

from django.conf.urls import url

urlpatterns = [
    url(r'^articles/2003/$', 'news.views.special_case_2003'),
    url(r'^articles/(?P<year>[0-9]{4})/$', 'news.views.year_archive'),
    url(r'^articles/(?P<year>[0-9]{4})/(?P<month>[0-9]{2})/$', 'news.views.month_archive'),
    url(r'^articles/(?P<year>[0-9]{4})/(?P<month>[0-9]{2})/(?P<day>[0-9]{2})/$', 'news.views.article_detail'),
]

I think this would be more flexible:

from django.conf.urls import url

urlpatterns = [
    url(r'^articles/2003/$', 'news.views.special_case_2003'),
    url(r'^articles/(?P<year>[0-9]{4})/$', 'news.views.year_archive'),
    url(r'^articles/(?P<year>[0-9]{4})/(?P<month>[0-9]{1,2})/$', 'news.views.month_archive'),
    url(r'^articles/(?P<year>[0-9]{4})/(?P<month>[0-9]{1,2})/(?P<day>[0-9]{1,2})/$', 'news.views.article_detail'),
]

[mardini]

Well, I think the wide-spread standard on the web is to use a two-digit month, 01 through 12, and a two-digit day, 01 through 31 in URLs dates.

[Aymeric Augustin]

The format used in the example also has the advantage of being unambiguous. It's a bad practice to have multiple URLs pointing to the same page, and that would be possible with the lax format.