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  1. import re
  2. rx = r'(?=(11?))\1(?!3)'
  3. s = '113'
  4. m = re.match(rx, s)
  5. if m:
  6.     print("Valid")
  7. else:
  8.     print("Invalid")
Success #stdin #stdout 0.02s 28384KB
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stdin
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Standard input is empty
stdout
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Invalid
https://ideone.com/LWJyM6
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
secret

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