Implementing Django URLs dispatching style in Servlets

[Hussein Baghdadi]

Hi,
I'm considering creating my own Java web framework that mimics Django actions routing.
Django uses regular expressions for matching URLs with actions:
urlpatterns = patterns('', (r'^articles/2003/$', 'news.views.special_case_2003'), (r'^articles/(\d{4})/$', 'news.views.year_archive'), (r'^articles/(\d{4})/(\d{2})/$', 'news.views.month_archive'), (r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'news.views.article_detail'), )
I don't have any code yet, just discussing things in my mind, here is my initial plan:
A Servlet filter is needed to intercept requests, this filter has a set of listed RegEx patterns. correct till now?

Lets say the application will have a big RegEx set, how to dispatch as fast as possible? it doesn't make sense to try to evaluate every RegEx in turn.
Thanks for help and time.

[Bear Bibeault]

Not much to do with servlets, so I'll move this to Performance.

[jijun lx]

maybe the UrlRewriteFilter will help you partially .

http://code.google.com/p/urlrewritefilter/