The Standard specified that constants in std::regex_constants to be constexpr variables ([re.const]).
However, MSVC STL just implements them as enumerators of unscoped enumerations, which are not variables.
It seems that they have never been specified be to non-object. In TR1 (WG21-N1836) they were static const variables.
libc++ is similarly buggy (llvm/llvm-project#69420).
Also tracked by VSO-498998 / AB#498998 .
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