Isn't replacement of complex patterns better served by generated regexes (and both .NET's built-in and Rust's most popular regex crate are very fast)?

(questioning whether this particular case is illustrative for the point the article makes)

Not seeing anything about if the C# code was compiled to native code using AOT.

> the Rust CPU time advantage is -75%.

This is in error.

The difference is -75% but the advantage is 75%.