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import re
text = "§s 23, 12"
print(re.sub(r'§\w*\s+\d+(?:,\s*\d+)*', lambda x: re.sub(r'\s+', '_', x.group()), text))

Success #stdin #stdout 0.03s 9616KB

stdin

Standard input is empty

stdout

§s_23,_12

https://ideone.com/kfUuz8

language:

Python 3 (python 3.12)

created:

visibility:

secret

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