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  1. import re
  2.  
  3. s = "aba\naaa\naba\n\naba"
  4. rx = r'(?:{0}(?:\n|$))+|(?:\n|^){0}'.format(r'[^b\n]*b.*')
  5. print(rx)
  6. print( re.sub(rx, '', s).replace('\n','\\n') )
  7.  
Success #stdin #stdout 0.01s 27744KB
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stdin
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Standard input is empty
stdout
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(?:[^b\n]*b.*(?:\n|$))+|(?:\n|^)[^b\n]*b.*
aaa\n
https://ideone.com/IQPAVj
language:
Python 3 (python  3.12)
created:
6 years ago
visibility:
secret

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