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SUBMIT YOUR IDEADefinitely made my solution a little more difficult than necessary. Was a little more difficult than I expected to solve. Fun though!
Did not have the patience to figure out the Regex for this. May not be efficient, but it works.
I did it using the formula mentioned in the post, then did it the long way.
Results from the long way:
Completed twice. My first solution is... quite a kludge, lol. I knew there had to be a better way, so I took a peek at a few other solutions and remembered that you can use regex in formulas. The light bulb came on and I did a second, much better solution. Both are included here for honesty. No spoilers for what the actual formula I used was, Figuring that out was the whole trick once I remembered that was an option!