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  1. import re
  2.  
  3. pattern = r"X0+(?=X)"
  4. s = "001000X00X001X00X"
  5.  
  6. print(re.sub(pattern, lambda x: x.group().replace('0', '2'), s))
Success #stdin #stdout 0.02s 9324KB
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stdin
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Standard input is empty
stdout
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001000X22X001X22X
https://ideone.com/rLcbtv
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
secret

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