I need a code generator that transforms a regular expression in any notation into C or C++ code, that allows recognition and extraction of data from the input.
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Why not use a regex library and the notation that goes with it?– Steve BarnesCommented Aug 20, 2016 at 11:02
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Because of bloat. My regex is constant.– user1095108Commented Aug 20, 2016 at 12:05
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Well, you can probably convert it to BNF and then create a parser out of it. Not sure if that's worth getting rid of the "bloat" though. And we'll laugh our arses off if that single regex expands to multiple regex.– Maarten BodewesCommented Aug 20, 2016 at 17:18
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It just needs to expand to code hehe :) My binary exploded 5x after using <regex>, generated code can easily beat that, I believe– user1095108Commented Aug 20, 2016 at 19:13
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1nothing automatic but you can do this with gpt4 and lots lots lots of handholding– RainbCommented May 24, 2023 at 12:28
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2 Answers
A few suggestions shamelessly copied from a similar SO question:
- re2c - "regular expression to C" says it's about generating lexers:
re2c is a lexer generator for C/C++. Its key features are:
Very fast lexers: the generated code is as good as a carefully tuned hand-crafted C/C++ lexer. It’s because re2c generates minimalistic hard-coded state machine (as opposed to full-featured table-based lexers).
but might still do what you want, if it actually takes regexps anywhere.
- regextl - dumps the state machine for a regular expression.
I haven't tried any of these so I can't actually recommend anything.
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11. is a lexer, which I don't need, 2. is unfinished. I'll just make my own if this keeps up. Commented Aug 21, 2016 at 11:08
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1Note that the fact that (1.) is a lexer does not mean it doesn't have the functionality you need. It might be using regexp matching for lexing. Anyway, if you do decide to write your own, please post an answer here with the link, I wouldn't mind having that. Commented Aug 21, 2016 at 11:13
Fo rmany years I have been extremely happy wiht RegEx Buddy. It is not free, but reasonably priced (and the OP does not ask for free).
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I don't see any code, make some C/C++ code and post it here please. Commented Oct 20, 2016 at 11:16
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The code is in the first image. Why not download the trial and generate some C/C++ yourself?– MawgCommented Oct 20, 2016 at 11:54
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