For the sake of completeness and in case someone with less regex-fu
that Karen, here is the correct urlpatterns:
urlpatterns = patterns('',
url(r'^$',
date_based.archive_index,
entry_info_dict,
name='entry_archive_index'),
url(r'^(?P<year>\d{4})/$',
date_based.archive_year,
dict(entry_info_dict,
make_object_list=True, template_object_name='entry'),
name='entry_archive_year'),
url(r'^(?P<year>\d{4})/(?P<month>\d{1,2})/$',
date_based.archive_month,
dict(entry_info_dict, month_format='%m'),
name='entry_archive_month'),
url(r'^(?P<year>\d{4})/(?P<month>\d{1,2})/(?
P<day>\d{1,2})/$',
date_based.archive_day,
dict(entry_info_dict, month_format='%m'),
name='entry_archive_day'),
url(r'^(?P<year>\d{4})/(?P<month>\d{1,2})/(?
P<day>\d{1,2})/(?P<slug>[-\w]+)/$',
date_based.object_detail,
dict(entry_info_dict, slug_field='slug',
month_format='%m'),
name='entry_detail'),
)