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

Since C++23

Checks if the string view contains the given substring, where

# Declarations

constexpr bool contains( basic_string_view sv ) const noexcept;

(since C++23)

constexpr bool contains( CharT c ) const noexcept;

(since C++23)

constexpr bool contains( const CharT* s ) const;

(since C++23)

# Parameters

# Return value

true if the string view contains the provided substring, false otherwise.

# Notes

Feature-test macro Value Std Feature __cpp_lib_string_contains 202011L (C++23) contains functions

# Example

#include <string_view>
using namespace std::literals;
 
static_assert
(
    // bool contains(basic_string_view x) const noexcept;
    "https://cppreference.com"sv.contains("cpp"sv) == true and
    "https://cppreference.com"sv.contains("php"sv) == false and
 
    // bool contains(CharT x) const noexcept;
    "C++23"sv.contains('+') == true and
    "C++23"sv.contains('-') == false and
 
    // bool contains(const CharT* x) const;
    std::string_view("basic_string_view").contains("string") == true and
    std::string_view("basic_string_view").contains("String") == false
);
 
int main() {}

# See also