I cant seem to find tutorials on how to build a programming language in rust, I've been trying to write a lexer but I can't get it to work.
Strange question. I think you need to ask this question in another platform and forum.
No, this is not strange at all, this is perfectly acceptable, for this forum.
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The question is quite open ended (and writing a compiler or interpreter for a full-fledged programming language can be a large project). For lexing and parsing specifically, you could try looking up some popular libraries and see how their tutorials and examples feel. Off the top of my head...
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Another rust project for parsing text...
Some useful resources are the Crafting Interpreters book and the cranelift-jit-demo repo. The demo project is written in Rust, so it's good for practical application. And the book should help with the more conceptual aspects of writing a language.
You asked specifically about writing a lexer, but there is a lot more to a language than just parsing text. That's why I've tried to answer the broader question of "how to build a programming language in Rust".
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