using one url would be:
url(r'''^narrow_category/(?P<first_digit>\d+)/(?P<words>\w*)'''
r'(?:\/(?P<second_digit>\d+))?'
r'(?:\/(?P<third_digit>\d+))?'
r'(?:\/(?P<fourth_digit>\d+))?$',
        'catalog.views.narrow_category', name="narrow_category"), 

second_digit, third_digit and fourth_digit parameters would be optional, 
and your view would look something like this:

def narrow_category(request, first_digit, words, second_digit, third_digit, 
fourth_digit):
ctx = {'first_digit': first_digit, 
'words': words, 
'second_digit': second_digit,
'third_digit': third_digit,
'fourth_digit': fourth_digit}
return render_to_response('narrow_category.html', ctx)


On Tuesday, April 9, 2013 9:28:59 AM UTC-5, frocco wrote:
>
> NoReverseMatch: Reverse for 'narrow_category' with arguments '(9L, u'pro 
> contact', u'', u'', u'')' and keyword arguments '{}' not found.
>
>
> url(r'^narrow_category/(\d+)/(\w*)/(\d*)/(\d*)/(\d*)/$', 
> 'catalog.views.narrow_category', name="narrow_category"),
>
> url(r'^narrow_category/(\d+)/(\w+)/$', 'catalog.views.narrow_category', 
> name="narrow_category_by_text"),
>
> url(r'^narrow_category/(\d+)/(\d+)/(\d+)/(\d+)/$', 
> 'catalog.views.narrow_category', name="narrow_category2"),
>
>

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