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  1. import re
  2. rx = r"(?<!\d)(\d+)\*\1(?!\d)|(\([\d+-]+\))\*\2"
  3. texts = ["5*5", "3.14*4", "(10-4)*(10-4)"]
  4. for text in texts:
  5.   print( [f'{x.group(1) or ""}{x.group(2) or ""}' for x in re.finditer(r'(?<!\d)(\d+)\*\1(?!\d)|(\([\d+-]+\))\*\2', text)] )
Success #stdin #stdout 0.02s 9532KB
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Standard input is empty
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['5']
[]
['(10-4)']
https://ideone.com/nxSlkE
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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