Rename Images

Hi everyone,

I have to rename about 1500 images as follows. All the images have their name separated by "-" and after the last "-" there is the word that I want.

For example:
aaaa-aaaaaaa-aa-aaa-xxxxx
(not including the "-" I want to remove everything except the "xxxxx")

How can I do it?
Thanks

Remove: .*-
Use regular expressions