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A comment on Building a Regex Engine in Fewer Than 40 Lines of Code.

Re:Building a Regex Engine in Fewer Than 40 Lines of Code by jlg23 on Tuesday December 05, 2017 @05:02AM (#15850861)
It have been a few years since I read the code, but it was so beautifully written that I cannot imagine it was screwed up in the meantime: Edi Weitz' CL-PPCRE[1] is a beautiful implementation in CL and highly recommended if one understands one aspect (CL or Perl compatible regular expressions) and wants to learn the other one. IIRC he even discovered some bugs in the original perl implementation while creating this library.

[1] https://github.com/edicl/cl-ppcre

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