# std::basic_string_view<CharT,Traits>::find_last_of

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< cpp‎ | string‎ | basic string view

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

Finds the last character equal to one of characters in the given character sequence. Exact search algorithm is not specified. The search considers only the interval `[`​0​`,` pos`]`. If the character is not present in the interval, npos will be returned.

1) Finds the last occurence of any of the characters of v in this view, ending at position pos.
2) Equivalent to find_last_of(basic_string_view( std::addressof (ch), 1), pos).
3) Equivalent to find_last_of(basic_string_view(s, count), pos).
4) Equivalent to find_last_of(basic_string_view(s), pos).

### Parameters

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

### Return value

Position of the last occurrence of any character of the substring, or npos if no such character is found.

### Complexity

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

### Example

Run this code

    #include <string_view>

    using namespace std::literals;
    constexpr auto N = std::string_view::npos;

    static_assert(
        5 == "delete"sv.find_last_of("cdef"sv) &&
          //       └────────────────────┘
        N == "double"sv.find_last_of("fghi"sv) &&
          //
        0 == "else"sv.find_last_of("bcde"sv, 2 /* pos [0..2]: "els" */) &&
          //  └────────────────────────┘
        N == "explicit"sv.find_last_of("abcd"sv, 4 /* pos [0..4]: "expli" */) &&
          //
        3 == "extern"sv.find_last_of('e') &&
          //     └────────────────────┘
        N == "false"sv.find_last_of('x') &&
          //
        0 == "inline"sv.find_last_of('i', 2 /* pos [0..2]: "inl" */) &&
          //  └───────────────────────┘
        N == "mutable"sv.find_last_of('a', 2 /* pos [0..2]: "mut" */) &&
          //
        3 == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 3 /* "cde" */) &&
          //     └─────────────────────────┘
        N == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 2 /* "cd" */)
    );

    int main() {}

### See also

find | find characters in the view (public member function)
rfind | find the last occurrence of a substring (public member function)
find_first_of | find first occurrence of characters (public member function)
find_first_not_of | find first absence of characters (public member function)
find_last_not_of | find last absence of characters (public member function)
find_last_of | find last occurrence of characters (public member function of `std::basic_string<CharT,Traits,Allocator>`)

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