aplefull d95baf67f6 LibJS: Prevent escaped surrogates from combining in Unicode regexes ...

Escaped surrogate sequences should not combine with adjacent literal
surrogates in Unicode mode.

We now use `\u{XXXX}` braces instead of `\uXXXX` when escaping code
units in Unicode mode, so LibRegex treats each as a standalone code
point. Also prevent GenericLexer from combining `\uXXXX` and `\u{XXXX}`.

2026-02-26 13:50:11 +01:00

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