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I actually have an M2 mac mini in the mail from Apple for exactly this purpose.
My time horizon is very long. It takes me a long time to do things these days.
It has never been true that I don't want to support it. Merely that it is difficult to verify and test. There is also the problem that the port from x86 to arm is not straight-forward, do to both my own ignorance and what I believe are important missing vector operations such as movemask.
This is discussed a bit more here (including the bit about movemask): https://github.com/BurntSushi/memchr/issues/76
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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It seems like the site doesn't really need a server so people have made offline versions.
So should be able to burn something like [1] to a disk.
[1]: https://github.com/ibaaj/Regex101.com-offline-app/pull/1/fil...
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regex
An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.
https://www.cs.princeton.edu/courses/archive/fall19/cos226/l... and https://kean.blog/post/lets-build-regex are excellent introductions to implementing a (very) simplified regex engine: construct a nondetermistic finite state automaton for the regex, then perform a graph search on the resulting digraph; if the vertex corresponding to your end state is reachable, you have a match.
I think this exercise is valuable for anyone writing regexes to not only understand that there's less magic than one might think, but also to visualize a bunch of balls bouncing along an NFA - that bug you inevitably hit in production due to catastrophic backtracking now takes on a physical meaning!
Separately re: the OP, https://github.com/rust-lang/regex/issues/822 (and specifically BurntSushi's comment at the very end of the issue) adds really useful context to the paragraph in the OP about niche APIs: https://blog.burntsushi.net/regex-internals/#problem-request... - searching with multiple regexes simultaneously against a text is both incredibly complex and incredibly useful, and I can't wait to see what the community comes up with for this pattern!
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ILSpy
.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!