Regular expressions for URLs

Hi everyone,
I have a question about regular expressions.
Let's say I want my program to extract last 10-digits from any URL that will be found (every found URL will end up on 10digit number!) and insert that number in the middle of other URL.
Would anyone tell me please how to do that?
Thank you

I am not sure how to do that either...
Actually I just figured out that there is no garantee that the URL will be ended on 10-digit number.
Ok, my program is meant to search for the movie info on Yahoo (user enters keyword to search and chooses either 'title', 'actor', 'trailer', 'review' in drop-down menu). After the 'search' button is clicked the appropriate page is supposed to be found.
For example, if the user types in 'shrek' and chooses 'trailer', the result is supposed to be this link http://movies.yahoo.com/movie/1808405861/trailer and not the
following ones:
http://movies.yahoo.com/mv/search?p=shrek
or
http://movies.yahoo.com/shop?d=hv&cf=info&id=1808405861
So in my program the line for the 'title' search is
url = "http://movies.yahoo.com/mv/search?type=all&p=";and it works for the titles. I thought if the found link has 10 -digit number on the end I can somehow 'catch' that number and insert into another link -so the page with trailers would be pulled up (it's an ID number in yahoo database) .
But now since I am not sure if 10-digit number is going to be in the found link at all, I have no idea how to 'catch' that number.
Does anyone have any ideas for my case?

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