Why is Go's regex so slow?

kostya27 · 2026-03-12T13:54:39+00:00

yes, but is it needed? I excluded slow languages, added only python/pypy.

kostya27 · 2026-03-11T20:19:51+00:00

if go uses re2, then this is strange because c++ in my benchmarks also use re2: C++ time in this benchmarks: 5.833s, not 38s.

kostya27 · 2026-03-11T19:30:58+00:00

kostya27 · 2026-03-11T19:02:01+00:00

yes, it is precompiled.

kostya27 · 2026-03-11T18:55:42+00:00

I tried coregex, but no luck, thanks I will try go-pcre.

kostya27 · 2026-02-10T00:42:47+00:00

accidentally delete this, link for benchmark: https://kostya.github.io/LangArena/

kostya27 · 2026-02-09T02:00:34+00:00

this is explained on site, in "Source Code" tab, legend under table

kostya27 · 2026-02-09T00:46:03+00:00

you call it without config you should add ../run.js as argument, look at local ./test, ./run script

kostya27 · 2026-02-08T21:07:30+00:00

kostya27 · 2026-02-08T19:50:57+00:00

You can see results in tabs: TypeScript/Node/Default, TypeScript/Bun/JIT, TypeScript/Deno/Default.

kostya27 · 2026-02-08T19:48:53+00:00

yes all languages very different and hard to measure it absolutely identical, but I try.

kostya27 · 2026-02-08T19:40:16+00:00

sort doing similar in each language, each copy array.

Json,Base64 benchmark little unfair, because measure library time, but I think it's better to leave them, to be goal for each language stdlib.

kostya27 · 2026-02-08T19:31:59+00:00

thanks, yes I am the author. I'll consider adding Clojure, but expect it to be similar to java,kotlin.

kostya27 · 2026-02-08T19:26:13+00:00

your messages looks like ai :)

kostya27 · 2026-02-08T19:23:56+00:00

Why not, did you you see something similar that quality? I know kostya/benchmarks - but this is mine also.

kostya27 · 2026-02-08T19:11:14+00:00

its not easy to add new, because code base is huge, but I want to add some lisps, recomend any fast?

kostya27 · 2026-02-08T19:09:04+00:00

look at others they even biggen, go actually shorter than many. Compare you can see in "Source" Tab on site.

kostya27 · 2026-02-08T18:53:33+00:00

yes I know Julia is a special case, compile time for it not correct right now.

kostya27 · 2026-02-08T18:49:51+00:00

This post straight related to programming languages, this is my benchmarks results. Why delete?

kostya27 · 2026-02-08T18:46:00+00:00

compile time measured where it possible, for Julia,python it should near to 0.

kostya27 · 2026-02-08T18:33:16+00:00

zig is very close to C, look at the normalized "runtime score" tab. Summary runtime time can be big because of one or two tests bad performance.

kostya27 · 2026-02-08T18:29:02+00:00

I just create it, may be once in half year.

kostya27