Help Parsing strings - extracting a substring from a string

What way can someone show me using a formula would I be able to pull a substring out of a string.

So given a string such as this URL:

What I want is to extract “QF1aQMDRTkeDKKdTHtQz” into a variable (any thing that exists after the “/” character)

Nevermind i can just use LEFT_STRIP 33 characters to get to the “/” position