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  1. import re
  2.  
  3. regex = r"(?<!\d)((\()?\d+(?:[.-]\d+)?(?(2)\)))\*\1(?!\d)"
  4.  
  5. test_str = ("5*5 --> 5  \n"
  6. 	"3.14*4 --> no return  \n"
  7. 	"(10-4)*(10-4) --> (10-4)")
  8.  
  9. for m in re.finditer(regex, test_str):
  10. 	print(m.group(1))
Success #stdin #stdout 0.02s 9332KB
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stdin
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Standard input is empty
stdout
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5
(10-4)
https://ideone.com/W0Fw92
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
public

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