[regexp] Update capture name parsing for recent spec changes
Capture group names were extended in https://github.com/tc39/ecma262/pull/1869/files https://github.com/tc39/ecma262/pull/1932/files RegExpIdentifierName now explicitly enables unicode (+U) for unicode escape sequences; likewise, surrogate pairs are now allowed unconditionally. The implementation simply switches on unicode temporarily while parsing a capture group name. Good news everyone, /(?<𝒜>.)/ is now a legal pattern. Bug: v8:10384 Change-Id: Ida805998eb91ed717b2e05d81d52c1ed61104e3f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3233234 Auto-Submit: Jakob Gruber <jgruber@chromium.org> Commit-Queue: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#77722}
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