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SUBMIT YOUR IDEAMy solution attached.
Had to peek at the solution to figure out what to do.
Added some commentary around the regex expressions to explain what it is doing and added a couple of extra steps to convert some data types at the end (specifically date and numeric types) so that the dataset is primed for analysis.
I couldn't figure out the pattern of the numerical values here, had too take a peek at a solution to find the pattern.
Once I knew which rows contained the data it all made sense.