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  1. import re
  2. pattern = r'_?[A-Z]{2,}_?|([A-Z](?:_[A-Z](?![A-Z]))+)'
  3. s = ("A_B_CDEF_GHI\n"
  4.             "A_B_C_DEF_G_H_I\n"
  5.             "ABC_D_E_F_GHI\n"
  6.             "ABCDEFG_H_I\n"
  7.             "A_B_C")
  8.  
  9. res = re.sub(pattern, lambda x: x.group(1).replace("_", "") if x.group(1) else x.group(), s)
  10. print(res)
Success #stdin #stdout 0.03s 9476KB
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stdin
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Standard input is empty
stdout
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AB_CDEF_GHI
ABC_DEF_GHI
ABC_DEF_GHI
ABCDEFG_HI
ABC
https://ideone.com/dYiPF8
language:
Python 3 (python  3.12)
created:
3 years ago
visibility:
secret

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