Find the first occurrence of a character not within the string.

template<
    typename T>
constexpr basic_static_string::size_type
find_first_not_of(
    const T& t,
    basic_static_string::size_type pos = 0) const noexcept(detail::is_nothrow_convertible< const T &, string_view_type >::value);
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Find the first occurrence of any of the characters not within the string.

template<
    std::size_t M>
constexpr basic_static_string::size_type
find_first_not_of(
    const basic_static_string< M, CharT, Traits >& str,
    basic_static_string::size_type pos = 0) const noexcept;
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constexpr basic_static_string::size_type
find_first_not_of(
    basic_static_string::const_pointer s,
    basic_static_string::size_type pos,
    basic_static_string::size_type n) const noexcept;
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constexpr basic_static_string::size_type
find_first_not_of(
    basic_static_string::const_pointer s,
    basic_static_string::size_type pos = 0) const noexcept;
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Find the first occurrence of a character not equal to c.

constexpr basic_static_string::size_type
find_first_not_of(
    basic_static_string::value_type c,
    basic_static_string::size_type pos = 0) const noexcept;
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