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

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(basic_string_view(std::addressof(ch), 1), pos).
3) Equivalent to find_first_not_of(basic_string_view(s, count), pos).
4) Equivalent to find_first_not_of(basic_string_view(s), pos).

Parameters

v - view to search for
pos - position at which to start the search
count - length of the string of characters to compare
s - pointer to a string of characters to compare
ch - character to compare

Return value

Position of the first character not equal to any of the characters in the given string, or std::string_view::npos if no such character is found.

Complexity

O(size() * v.size()) at worst.

Example

#include <string_view>
using namespace std::literals;
 
int main()
{
    static_assert(2 == "BCDEF"sv.find_first_not_of("ABC"));
                    //    ^
    static_assert(4 == "BCDEF"sv.find_first_not_of("ABC", 4));
                    //      ^
    static_assert(1 == "BCDEF"sv.find_first_not_of('B'));
                    //   ^
    static_assert(3 == "BCDEF"sv.find_first_not_of('D', 2));
                    //     ^
}

See also

(C++17)
 find characters in the view
(public member function)
(C++17)
 find the last occurrence of a substring
(public member function)
(C++17)
 find first occurrence of characters
(public member function)
(C++17)
 find last occurrence of characters
(public member function)
(C++17)
 find last absence of characters
(public member function)
find first absence of characters
(public member function of std::basic_string<CharT,Traits,Allocator>)

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