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Why \d+ doesn't work:

You're using a look-ahead match, which implicitly means the actual match group is the "space" between characters, i.e. match.start() = match.end(). Since you're matching at...

StackOverflow: How to split a string but also keep the delimiters

The accepted answer may be what you're looking for, applied here you just use + instead of ; as the "delimiter".

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