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  1. import re
  2. s = "aba\naaa\naba\naaa\naba"
  3. print( re.sub(r'(?:[\r\n]+.*b.*)+$|^.*b.*[\r\n]*', '', s, flags=re.M).replace('\n','\\n') )
  4.  
Success #stdin #stdout 0.01s 27792KB
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stdin
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Standard input is empty
stdout
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aaa\naaa
https://ideone.com/7Hwx62
language:
Python 3 (python  3.12)
created:
6 years ago
visibility:
secret

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