python - Unknown specifier in URL when using Django-Tagging -

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hi getting following error;

    error @ /     unknown specifier: ?p[

this urls file looks like;

urlpatterns = patterns('mainpage.views', (r'^$', 'index'), (r'^post/(?p<id>\d+)/$', 'post'), (r'^projects/$', 'projects'), (r'^about/$', 'about'), (r'^tags/$', 'tags'), (r'^tag/(?p[-_a-za-z0-9]+)/$', 'with_tag'), (r'^tag/(?p[-_a-za-z0-9]+)/page/(?pd+)/$', 'with_tag'),                   (r'^comments/$', include('django.contrib.comments.urls'))

the 2 urls view name of with_tag offending urls. following this tutorial;

to tagging working on site. using django-tagging 1.3.1 , python 2.7.

can tell me doing wrong urls.py file please? copying tutorial book there must different in set compared set used in tutorial?

this not related django-tagging, it's regex syntax error. ?p indicates named group, , requires name after it: ?p<foo>. so, either add names groups, or make them numbered (i.e. remove ?p part).


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