[libcxx-commits] [libcxx] [libc++] Fix `regex_search` to match `$` alone with `match_default` flag (PR #77256)

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alexfh wrote:

As usual: if the behavior is not intended (which I suspect is true) and there's no obvious and reliable fix, I'd suggest to revert first.

https://github.com/llvm/llvm-project/pull/77256