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I like to start with the simplest regex solution possible, and adjust as I hit edge cases. For your situation, I would try looking for a number, followed by a space, followed by a number. Then replace it with the 2 numbers. The regex function which does that looks like this:
REGEX_Replace([Field], "(\d) (\d)", "$1$2")
You will have to check your data a bit to make sure no unwanted side-effects occur and that all of the changes you are expecting are made. If it accomplishes the goal, great! If not, we can tweak further.