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Ok, so in your .html file, you should have an action= in your form, which sort of looks like that regular expression. At the very least it should look something similar to:
action="/user/{{ object.id }}/"
object.id would be replaced with whatever object you passed to the html file in your view.
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The url template tag allows you to save some repetition here. It also prevents you from breaking the form if you change urls.py. If your urlpattern looks like this:
(r'^user/(?P<id>\d+)/$', 'user.views.detail')
Then you could use the template tag like this:
<form action="{% url user.views.detail object.id %}">
Source:stackexchange.com