>> I’m looking forward to someone improving the performance of Go’s regexp package, which is quite slow.

Hah, this reminds me how over several years ago, I rewrote one of my homework from Go to Python, since Go version was so terribly slow because of regex. I really hoped it was better in 2021.

According to my totally unscientific benchmarks, if the performance of Rust's regular expression module were 1x, Go's was 8x and Ruby's was 32x, and Java's was 42x. Using Google's Java regex module improved the speed quite a bit but still was at ~18x. I was very impressed to see Rust doing so well. And it was sad to see Java so underperforming in such a typical workload. I know we're measuring libraries not languages, but I think regexes are so prevalent that not optimizing for it would hinder the language's real life performance.

Rust -> Ruby -> Java -> Golang

https://github.com/mariomka/regex-benchmark

Though it appears the numbers are two years old or so, and only for 3 specific regexes.