289337 2025-03-07 07:04:32 -0800 REGRESSION (285042@main-285687@main): `RegExp["$&"]` incorrectly returns an empty string 2025-03-11 17:00:59 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://github.com/oven-sh/bun/issues/17978 InRadar, Regression P2 Minor --- 1 webkit ysuzuki ben mark.lam msaboff webkit-bug-importer yijia_huang ysuzuki oldest_to_newest 2101363 0 webkit 2025-03-07 07:04:32 -0800 `RegExp["$&"]` should return the last matched substring but now returns an empty string when using `.match(/bar/g)`. However, it works if the match includes a capturing group. ```js "foo bar baz".match(/bar/g); console.log([RegExp["$&"]]); // Expected: ["bar"], Current: [""] "foo bar baz".match(/ba(r)/g); console.log([RegExp["$&"]]); // Expected and Current: ["bar"] ``` Observed Behavior: - Broke between WebKit commits `96471cc` and `1b53bfc` - See bun's fork diff https://github.com/oven-sh/WebKit/compare/543cca2...9b84f43 (bun `1.1.33..1.1.34`) Possible Cause: https://commits.webkit.org/285090@main --- reported on Bun's repo https://github.com/oven-sh/bun/issues/17978 2101800 1 webkit-bug-importer 2025-03-09 18:38:12 -0700 <rdar://problem/146622507> 2101820 2 ysuzuki 2025-03-09 21:33:43 -0700 Pull request: https://github.com/WebKit/WebKit/pull/42177 2101868 3 ews-feeder 2025-03-10 01:25:52 -0700 Committed 291881@main (cc0a0f907148): <https://commits.webkit.org/291881@main> Reviewed commits have been landed. Closing PR #42177 and removing active labels. 2102393 4 ews-feeder 2025-03-11 17:00:59 -0700 Committed 289651.257@safari-7621-branch (90e15f4a2340): <https://commits.webkit.org/289651.257@safari-7621-branch> Reviewed commits have been landed. Closing PR #2776 and removing active labels.