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  1. import re
  2. exp = "1+2+N3"
  3. variable_refs = re.compile(r"(?<!N)([0-9]+)")
  4. exp_template = re.sub(variable_refs, r'{key_\1}', exp)
  5. print(exp_template)
  6.  
Success #stdin #stdout 0.04s 9868KB
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Standard input is empty
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{key_1}+{key_2}+N3
https://ideone.com/nEAR55
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
secret

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