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Ooh, you're right. I had it that way to start and then ran into problems with a test case that had 663. It was splitting that grouping because it hit the matching case first. But when I removed the capture group generic and made it non-digit that solved that. So can revert back. Thanks :)
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You should be able to simplify it a little by changing the + to a * so you don't need the second \D I think?
(\D)\1*|(\d+)
Ooh, you're right. I had it that way to start and then ran into problems with a test case that had 663. It was splitting that grouping because it hit the matching case first. But when I removed the capture group generic and made it non-digit that solved that. So can revert back. Thanks :)