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  1. import re
  2.  
  3. s = '''
  4. COMMENTS:  
  5. first comment /user_x  
  6. second comment
  7. two lines /user_y
  8. Here is some unimportant text.  
  9. KEYWORD:
  10. Don't match comments or anything else after first keyword like this /user_x  
  11. KEYWORD: <- again
  12. Also ignore same keyword which could appear serveral times.
  13. '''
  14. pattern = re.compile(r'COMMENTS:\s*((?:(?:(?!KEYWORD:).)+?/(?:user_x|user_y))+).+?KEYWORD:', flags=re.DOTALL)
  15. match = re.search(pattern, s)
  16. if match:
  17.     print(match.group(1))
  18.  
  19.  
Success #stdin #stdout 0.02s 27712KB
comments ()
stdin
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Standard input is empty
stdout
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first comment /user_x  
second comment
two lines /user_y
https://ideone.com/R2Qvbg
language:
Python 3 (python  3.12)
created:
6 years ago
visibility:
secret

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