Remove 'up to third occurrence of /' from a string?

How would I remove up to the third occurrence of the / in the following string:
/Users/troykrueger/Dropbox/MDA/Numbers/Exports/Thu, Jul 5, 2018 3-04-43.csv

to end up with:
Dropbox/MDA/Numbers/Exports/Thu, Jul 5, 2018 3-04-43.csv

I can do it in FMP, and I know it's in KM, I'm just not coming up with the simple solution.
Thank you~

One approach:


(() => {
    'use strict';

        fp = Application('Keyboard Maestro Engine')

    return fp.split('/')
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Easily done with a regex search and replace ^/(.*?)/(.*?)/:

Keyboard Maestro Actions.kmactions (758 B)

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