Grep string help

[Biks 9]

I'm just trying to find a string to select the last half of a url. I want to trim off the text to the right of the last forward slash. I want this:

 

http://user.domain.com/post/11735684801/this-is-a-post

 

To turn into this

 

http://user.domain.com/post/11735684801

 

The flow I want to achieve is - start at the end, select everything back to the first slash. What I've come up with is this:

 

http://img84.imageshack.us/img84/7052/grepexample.jpg

 

With \x2f.+.$ - it ignores all the slashes to the first one, why? What am I doing wrong?

 

With [0123456789]\x2f.+.$ - I'm almost there, but I don't want the last number included.

 

I've spent way too much time with Photoshop to get a deep understanding of this programming stuff! :-P