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  1. import re
  2.  
  3. string = "It was never going to work, he thought. He did not play so well, so he had to practice some more. Not foobar !"
  4.  
  5. transformed = re.sub(r'(?:not|never|no)[\w\s]+[^\w\s]', 
  6.   		lambda match: re.sub(r'(\s+)(\w+)', r'\1NEG_\2', match.group(0)), 
  7. 			string,
  8.       flags=re.IGNORECASE)
  9.  
  10. print transformed
Success #stdin #stdout 0.01s 7896KB
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It was never NEG_going NEG_to NEG_work, he thought. He did not NEG_play NEG_so NEG_well, so he had to practice some more. Not NEG_foobar !
https://ideone.com/ljZWHS
language:
Python (cpython 2.7.16)
created:
9 years ago
visibility:
public

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