Yet Another NoReverseMatch Error

I have an app within my project called popular_keywords. 

Within urls.py I have this:

urlpatterns = patterns("apps.popular_keywords.views",

                       url("^%keyword/(?P<keyword>.*)%s$" % _slashes, "matching_items_list", name="matching_items")

)

Within views.py I have this function:

def matching_items_list(request, keyword=None, template="popular_keywords/keyword_matched_list.html")

In my template I have this:

<a href="{% url "matching_items" keyword=keyword %}">

The problem is when I view my page I find this:

NoReverseMatch at /

Reverse for 'matching_items' with arguments '()' and keyword arguments '{u'keyword': 'Cake'}' not found.

I thought I had my bases covered, but as a Django noob, I would appreciate help on whatever silly thing I missed. Please let me know if I need to provide more information.

Thanks.

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