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  1. import re
  2. s = 'A. (abbaabb) .A. (bbabbaba) .A. (bbbbabbbb)'
  3. print(re.sub(r'\([^()]+\)', lambda x: x.group().replace('A', ''), s))
Success #stdin #stdout 0.02s 9512KB
stdin
Standard input is empty
stdout
A. (abbaabb) .A. (bbabbaba) .A. (bbbbabbbb)