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

[Sanjay Marreddi via libcxx-commits]

SanjayMarreddi wrote:

I have created the revert. Will add this test case and work on relanding the patch.

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