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  1. import re
  2.  
  3. strings = [
  4.     "0X001000X00X001X00X0",
  5.     "001000X00X001X00X",
  6.     "000X000",
  7.     "000"
  8. ]
  9.  
  10. pattern = r"(?:X0+|^0+)(?=X|$)"
  11.  
  12. for s in strings:
  13.     print(re.sub(pattern, lambda x: x.group().replace('0', '2'), s))
Success #stdin #stdout 0.03s 9564KB
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stdin
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Standard input is empty
stdout
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2X001000X22X001X22X2
001000X22X001X22X
222X222
222
https://ideone.com/Z2SOTa
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
secret

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