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fix(analyzer): noUselessEscapeInRegex preserves required v-flag escapes #10084

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dyc3 merged 5 commits into from
Apr 22, 2026
Merged

fix(analyzer): noUselessEscapeInRegex preserves required v-flag escapes #10084

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07f5b2e
test(linter): add failing tests for noUselessEscapeInRegex v-flag res…
jiwon79 Apr 21, 2026
4e3a046
fix(analyzer): noUselessEscapeInRegex preserves required v-flag escapes
jiwon79 Apr 21, 2026
6ab31fd
chore: add changeset for noUselessEscapeInRegex v-flag fix
jiwon79 Apr 22, 2026
54c69ed
test(linter): add missing `\%\%` doubled-escape case to noUselessEsca…
jiwon79 Apr 22, 2026
65225f5
docs(analyzer): link ECMA spec for ClassSetReservedPunctuator in noUs…
jiwon79 Apr 22, 2026
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chore: add changeset for noUselessEscapeInRegex v-flag fix 
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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@jiwon79 @claude @dyc3
2 people authored and dyc3 committed Apr 22, 2026
commit 6ab31fdc3bf75d2ee5da808cab83763255050705
11 changes: 11 additions & 0 deletions .changeset/bumpy-moose-allow.md
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---
"@biomejs/biome": patch
---

Fixed [#10034](https://github.com/biomejs/biome/issues/10034): [`noUselessEscapeInRegex`](https://biomejs.dev/linter/rules/no-useless-escape-in-regex/) no longer flags escapes of `ClassSetReservedPunctuator` characters (`&`, `!`, `#`, `%`, `,`, `:`, `;`, `<`, `=`, `>`, `@`, `` ` ``, `~`) inside `v`-flag character classes as useless. These characters are reserved as individual code points in `v`-mode, so the escape is required.

The following pattern is now considered valid:

```js
/[a-z\&]/v;
```