fork(2) download 
  1. import re
  2. s = "aba\naaa\naba\n\naba"
  3. print( re.sub(r'(?:[\r\n]+.*b.*)+$|^.*b.*', '', s, flags=re.M).replace('\n','\\n') )
  4.  
Success #stdin #stdout 0.02s 27712KB
comments (?)
stdin 
Standard input is empty
stdout 
\naaa
https://ideone.com/tKEBwa
language:
Python 3 (python  3.12)
created:
7 years ago
visibility:
secret

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