c4urself

(r'^articles/(?P<year>\d{4}/?$, 'main.views.year'),

# When a use case comes up that a month needs to be involved as
# well, you add an argument in your regex:

(r'^articles/(?P<year>\d{4}/(?P<month>\d{2})/?$, 'main.views.year_month'),

# That works fine, unless of course you want to show something
# different for just the year, in which case the following case can be
# used, making separate views based on the arguments as djangoproject