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  1. import re
  2.  
  3. def replace(e): 
  4. 	return e
  5.  
  6. s = 'hi how are you today 23:i ok im good 1:e'
  7. rx = r'(?<!\S)(?!\d{1,2}:[ie](?!\S))\S+'
  8. print(re.sub(rx, lambda x: replace(x.group().lower()), s))
Success #stdin #stdout 0.02s 27752KB
comments (?)
stdin 
Standard input is empty
stdout 
hi how are you today 23:i ok im good 1:e
https://ideone.com/PORCvH
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
secret

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