size_type find_last_not_of(basic_string_view<charT, traits> sv,
size_type pos = npos) const noexcept;
size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept;
size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
size_type find_last_not_of(const charT* s, size_type pos = npos) const;
size_type find_last_not_of(charT c, size_type pos = npos) const;