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SUBMIT YOUR IDEAI got the one-tool solution!! Whoop whoop!
Not the one tool solution, but here's mine.
I've messed around with the RegEx with this one for a while on a few occasions but it's just beyond me for now. Finally gave in and did it the long way. This is definitely worse because it would lose capitalisation on mid-sentence Proper nouns but it's enough for this case
I knew what single tool I could use. This was more a case of my being able to look up and apply certain rules I needed.