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  1. import re
  2.  
  3. s = 'ACAABAACAAABACDBADDDFSDDDFFSSSASDAFAAACBAAAFASD'
  4. pattern = r'[B-Z](?=AAA)'
  5. result = re.findall(pattern, s)
  6.  
  7. print(result)
Success #stdin #stdout 0.02s 9508KB
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Standard input is empty
stdout
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['C', 'F', 'B']
https://ideone.com/VDxNs0
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
secret

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