Make regex string for ``PluggableSite`` urlpatterns: prepend url
            with parent object's url and app name.

            See also: http://code.djangoproject.com/ticket/11559.

def make_regex(self, url):
        '''
            Make regex string for ``PluggableSite`` urlpatterns: prepend url
            with parent object's url and app name.

            See also: http://code.djangoproject.com/ticket/11559.
        '''
        return r"^%s/%s%s$" % (self.object_getter.regex, self.app_name, url)