RegEx - Get All Characters After Last Slash in URL

Question

I\'m working with a Google API that returns IDs in the below format, which I\'ve saved as a string. How can I write a Regular Expression in javascript to trim the string to

Answer 1

this is easy to understand (?!.*/).+

let me explain:

first, lets match everything that has a slash at the end, ok? that's the part we don't want

.*/ matches everything until the last slash

then, we make a "Negative lookahead" (?!) to say "I don't want this, discard it"

(?!.*) this is "Negative lookahead"

Now we can happily take whatever is next to what we don't want with this .+

YOU MAY NEED TO ESCAPE THE / SO IT BECOMES:

(?!.*\/).+