matching a domain name in urls.py

I am building an app that passes a domain name to urls.py like so "/
sites/domain.com/'

but I cannot get my urls.py to match the 'domain.com' it only seems
to match if i just use domain without the dot

I have tried

(r'^zones/^[^/]+/', get_domain),
(r'^zones/(?P<domain>\w+)/', get_domain),
(r'^zones/(?P<domain>\w+)$', get_domain),

and none seem to be able to catch it

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