[Python] Python regex capture group containing nested non-capturing group

I'm trying to capture string-parts Abbb, Abb, Ab, A, C###, C#, C, etc. into one group and whatever follows (anything that's not b, #) into a separate group. I'm using this regex:

sample = "Cbb-7" # for testing purposes
re.search(r"([A-G](?:#*|b*))(.*?)", sample).groups()


which results in: ('C', '') while I'm expecting: ('Cbb', '-7').

When modifying the regex to (greedy follow-up capture group(.*)):

re.search(r"([A-G](?:#*|b*))(.*)", sample).groups()


I get the result: ('C', 'bb-7'). (I still would need: ('Cbb','-7'))

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