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  1. import re
  2. text = "hi how are you\n\nhow you doing\nhow was your day"
  3. print(re.sub(r'(?<!\n)\n(?!\n)', ' ', text))
Success #stdin #stdout 0.01s 27712KB
comments (?)
stdin 
Standard input is empty
stdout 
hi how are you

how you doing how was your day
https://ideone.com/qANIGi
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
public

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