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  1. import re
  2. LIST1=["AR BR_18_0138249",  "AR R_16_01382649",  "BR 16 0138264", "R 16 01382679" ]
  3. pattern = r"\b(B?R(?=([\s_]))(?:\2\d+)+)\b(?!.*\b\1\b)"
  4. for i in LIST1:
  5.   rest = re.search(pattern, i)
  6.   if rest:
  7.     print(rest.group(1))
Success #stdin #stdout 0.02s 9720KB
comments (?)
stdin 
Standard input is empty
stdout 
BR_18_0138249
R_16_01382649
BR 16 0138264
R 16 01382679
https://ideone.com/8X2jRm
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
secret

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