[#35FAFEBF66E9305C8E440421B702D9E49E37DB0E]
Return the position of the last non-match
constexpr
size_type
find_last_not_of(
core::string_view str,
size_type pos = core::string_view::npos) const noexcept;
See `core::string_view::find_last_not_of`