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RegExp duplicate named capture groups

Category

JavaScript

Type

Chromium catches up

Status

Enabled by default (Chrome 125)

Intent stage

None

• Breaking change: No
• Enterprise impact: None
• Chromium flag: --js-regexp-duplicate-named-groups
• Spec maturity: Working draft
• Web Platform Tests: Yes

WPT details: Tested in test262. https://github.com/tc39/test262/pull/3625 https://github.com/tc39/test262/pull/3706 https://github.com/tc39/test262/pull/3709

Summary

https://github.com/tc39/proposal-duplicate-named-capturing-groups

Motivation

https://github.com/tc39/proposal-duplicate-named-capturing-groups

Standards & signals

• Specification: https://github.com/tc39/ecma262/pull/2721
• Firefox: Positive — Firefox uses V8's regexp engine, so it is not actually an independent implementation here.
• Safari: Shipped/Shipping — Stage 3 TC39 proposal.
• Web developers: No signals

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=regexp-duplicate-named-capture-groups
• Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
• GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
• chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+RegExp%20duplicate%20named%20capture%20groups
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=RegExp%20duplicate%20named%20capture%20groups
• Baseline status: https://webstatus.dev/?q=RegExp%20duplicate%20named%20capture%20groups

View on chromestatus.com