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  1. import re
  2.  
  3. pattern = r"\b(?P<year>\d{4})(-)?(?P<month>(?(2)\d\d?|\d\d))\b"
  4. s = ("202301\n"
  5.             "2023-1\n"
  6.             "2023-01\n"
  7.             "20231")
  8.  
  9. for m in re.finditer(pattern, s):
  10.     print(m.groupdict())
Success #stdin #stdout 0.03s 9876KB
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Standard input is empty
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{'year': '2023', 'month': '01'}
{'year': '2023', 'month': '1'}
{'year': '2023', 'month': '01'}
https://ideone.com/S2wipB
language:
Python 3 (python  3.9.5)
created:
1 year ago
visibility:
secret

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