Node.js is 300x faster than Bun at isbot regexp

[strager]

What version of Bun is running?

1.0.1

What platform is your computer?

Linux 5.19.0-46-generic x86_64 x86_64

What steps can reproduce the bug?

$ # Download the test script and test file: https://github.com/quick-lint/bun-vs-node/tree/f5ca9314fde7432f8b20339b8380bb15203606af/bun-regexp-bug
$ git clone --depth=1 git@github.com:quick-lint/bun-vs-node.git
$ cd bun-vs-node/bun-regexp-bug/

$ node benchmark.mjs               
263487 lines processed
took 201.37601999938488 ms

$ bun run benchmark.mjs         
263487 lines processed
took 65417.94360200001 ms

What is the expected behavior?

Node.js and Bun have comparable performance. Maybe one is twice as fast as the other.

What do you see instead?

Bun is significantly slower than Node.js with this regexp.

Additional information

Possibly related: #3464

[vegerot]

WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=258706

[dylang]

Hi! I don't suppose it's possible to use https://github.com/google/re2 as a replacement to JSC's regex engine until the performance problems can be addressed?

[zoto-ff]

Hi! I don't suppose it's possible to use https://github.com/google/re2 as a replacement to JSC's regex engine until the performance problems can be addressed?

i think no because it's not compatible with JS standarts. you can try to use node-re2