Need preg_replace help

I have links that vary and look something like this:

somesite/articles/25/news/15/1/141720.html

somesite/articles/10/25/updates/3/1/1413410.html

somesite/makers/16/11/press/1/7/145623.html

etc. etc.

I need to strip / preg_replace everything except these (the html IDs at the end of the links):

141720.html
1413410.html
145623.html

etc. etc.

They always vary too. So... Is there a way? I was thinking stripping everything before the last slash forward, but then what? How do you get those...

Need preg_replace help WordPress ...