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  1. import re
  2. text = "it's level I, not level II or level III. It's Level I, not Level II or Level III."
  3. print(re.sub(r'\b([lL]evel\s+)I\b', r'\g<1>1', text))
  4. print(re.sub(r'(?<=\b[lL]evel )I\b', '1', text))
Success #stdin #stdout 0.03s 9596KB
comments (?)
stdin 
Standard input is empty
stdout 
it's level 1, not level II or level III. It's Level 1, not Level II or Level III.
it's level 1, not level II or level III. It's Level 1, not Level II or Level III.
https://ideone.com/lb5zh4
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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