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  1. import re 
  2. print('"{}"'.format(re.sub(r'(?<=\s)ff','fast-forward',' ff')))
Success #stdin #stdout 0.02s 7072KB
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Standard input is empty
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" fast-forward"
https://ideone.com/2vZzJM
language:
Python (cpython 2.7.16)
created:
5 years ago
visibility:
secret

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