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  1. import re
  2. p = re.compile(r'(?<!C\(=O\))N')
  3. strs = ["C(=O)N", "C(=O)CN", "C(=O)NCCCN"]
  4. print([x for x in strs if p.search(x)])
Success #stdin #stdout 0.01s 9016KB
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Standard input is empty
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['C(=O)CN', 'C(=O)NCCCN']
https://ideone.com/UtXpRb
language:
Python (cpython 2.7.16)
created:
8 years ago
visibility:
secret

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