Regex pattern

Hello,

I have some random paths and i want to get the file at the end of the path. The paths look like this: C:\Users\random\Desktop\random1\random1 update\updated\123\whaever\bin\yes\Directory\randomSong.mp3

Which is the pattern to get only this; randomSong.mp3?  Or even better this: randomSong.

Sorry but i am really bad at regex.