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std::basic_string_view<CharT,Traits>::find_first_not_of

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constexpr size_type
    find_first_not_of( basic_string_view v, size_type pos = 0 ) const noexcept;
(1) (since C++17)
constexpr size_type
    find_first_not_of( CharT ch, size_type pos = 0 ) const noexcept;
(2) (since C++17)
constexpr size_type
    find_first_not_of( const CharT* s, size_type pos, size_type count ) const;
(3) (since C++17)
constexpr size_type
    find_first_not_of( const CharT* s, size_type pos = 0 ) const;
(4) (since C++17)

Finds the first character not equal to any of the characters in the given character sequence.

1) Finds the first character not equal to any of the characters of v in this view, starting at position pos.
2) Equivalent to find_first_not_of