std::basic_string_view<CharT,Traits>::rfind
From cppreference.com
constexpr size_type rfind(basic_string_view v, size_type pos = npos) const noexcept;
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(1) | (since C++17) |
constexpr size_type rfind(CharT c, size_type pos = npos) const noexcept;
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(2) | (since C++17) |
constexpr size_type rfind(const CharT* s, size_type pos, size_type count) const;
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(3) | (since C++17) |
constexpr size_type rfind(const CharT* s, size_type pos = npos) const;
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(4) | (since C++17) |
Finds the last substring equal to the given character sequence.
1) Finds the last occurence of
v in this view, starting at position pos.2) Equivalent to
rfind(basic_string_view(std::addressof(c), 1), pos).3) Equivalent to
rfind(basic_string_view(s, count), pos).4) Equivalent to
rfind(basic_string_view(s), pos).Parameters
| v | - | view to search for |
| pos | - | position at which to start the search |
| count | - | length of substring to search for |
| s | - | pointer to a character string to search for |
| ch | - | character to search for |
Return value
Position of the first character of the found substring or npos if no such substring is found.
Complexity
O(size() * v.size()) at worst.
Example
Run this code
#include <string_view>
int main()
{
using namespace std::literals;
constexpr auto N = std::string_view::npos;
static_assert(true
&& (6 == "AB AB AB"sv.rfind("AB"))
&& (6 == "AB AB AB"sv.rfind("ABCD", N, 2))
&& (3 == "AB AB AB"sv.rfind("AB", 5))
&& (2 == "B AB AB "sv.rfind("AB", 2))
&& (N == "B AB AB "sv.rfind("AB", 1))
&& (5 == "B AB AB "sv.rfind('A'))
&& (4 == "AB AB AB"sv.rfind('B', 4))
&& (N == "AB AB AB"sv.rfind('C'))
);
}
See also
| find characters in the view (public member function) | |
| find first occurrence of characters (public member function) | |
| find last occurrence of characters (public member function) | |
| find first absence of characters (public member function) | |
| find last absence of characters (public member function) | |
| find the last occurrence of a substring (public member function of std::basic_string<CharT,Traits,Allocator>)
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