On 3/11/24 6:49 AM, Yoav Weiss (@Shopify) wrote:



On Fri, Mar 8, 2024 at 4:26 PM Mike Taylor <miketa...@chromium.org> wrote:

    LGTM1

    On 3/7/24 6:22 PM, Shu-yu Guo wrote:


            Contact emails

    pth...@chromium.org, s...@chromium.org


            Explainer

    None


            Specification

    https://github.com/tc39/ecma262/pull/2721


What are the implications of this on regexes that already have duplicate named capture groups? Would their behavior change?
Shu can confirm, but my understanding is any regexes in the wild that have duplicate named capture groups today are just busted (they should throw a SyntaxError - and those are pretty hard to miss). If they do exist in the wild, they should start working, which in theory would match author intent. The risk seems very low IMHO, if it exists at all.



            Summary

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



            Blink component

    Blink>JavaScript>Regexp
    
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EJavaScript%3ERegexp>


            TAG review

    None


            TAG review status

    Not applicable


            Risks



            Interoperability and Compatibility

    This is a Stage 3 TC39 proposal. No known interop risk. No known
    web incompatibility risk.



    /Gecko/: Positive Firefox uses V8's regexp engine, so it is not
    actually an independent implementation here.

    /WebKit/: Shipped/Shipping
    (https://bugs.webkit.org/show_bug.cgi?id=252553) Stage 3 TC39
    proposal.

    /Web developers/: No signals

    /Other signals/:


            Ergonomics

    No known ergonomics risks.



            Activation

    This is unlikely to be polyfillable since it's adding a new kind
    of RegExp syntax.



            Security

    No known security risks.



            WebView application risks

    Does this intent deprecate or change behavior of existing APIs,
    such that it has potentially high risk for Android WebView-based
    applications?

    None



            Debuggability

    Debuggable like any other JS RegExp.



            Will this feature be supported on all six Blink platforms
            (Windows, Mac, Linux, ChromeOS, Android, and Android
            WebView)?

    Yes


            Is this feature fully tested by web-platform-tests
            
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?

    Yes

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



            Flag name on chrome://flags

    --js-regexp-duplicate-named-groups


            Finch feature name

    None


            Non-finch justification

    None


            Requires code in //chrome?

    False


            Estimated milestones

    DevTrial on desktop         123

    DevTrial on Android         123



            Anticipated spec changes

    Open questions about a feature may be a source of future web
    compat or interop issues. Please list open issues (e.g. links to
    known github issues in the project for the feature specification)
    whose resolution may introduce web compat/interop risk (e.g.,
    changing to naming or structure of the API in a
    non-backward-compatible way).

    None


            Link to entry on the Chrome Platform Status

    https://chromestatus.com/feature/5149208388829184

    This intent message was generated by Chrome Platform Status
    <https://chromestatus.com/>.
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