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  1. import re
  2. text = "aaa, aa, a,broom, school...boo, gool, ooow."
  3. print( re.sub(r'\b(([a-zA-Z])\2+)\b|([a-zA-Z])\3+', r'\1\3', text) )
Success #stdin #stdout 0.02s 9680KB
stdin
Standard input is empty
stdout
aaa, aa, a,brom, schol...bo, gol, ow.