Trying to figure out URL dispatcher for sluggale URLs like stackoverflow

Question

I'm using the Tornado framework (Python). I have the sluggable URLs working. But I have 3 different entries in the URL dispatcher. I was wondering if someone could help me transform it into one line.

This is what I have:

(r"/post/([0-9]+)/[a-zA-Z0-9\-]+", SpotHandler),
(r"/post/([0-9]+)/", SpotHandler),
(r"/post/([0-9]+)", SpotHandler),

I want it so that the following URLs all go to the same place.

http://domain.com/post/14

http://domain.com/post/14/

http://domain.com/post/14/any-text-it-doesnt-matter-what-it-is

Answer 1

(r"/post/([0-9]+)/?[a-zA-Z_]*", SpotHandler),

"?" means previous thing can be there but need not be. "*" means zero or more

Answer 2

r"/post/([0-9]+)(?:/[a-zA-Z_-]+|/)?"