From cppreference.com
constexprboolcontains(basic_string_viewsv)constnoexcept; (1) (since C++23)constexprboolcontains(CharTc)constnoexcept; (2) (since C++23)constexprboolcontains(constCharT*s)const; (3) (since C++23)Checks if the string view contains the given substring, where
1) the substring is a string view.
2) the substring is a single character.
3) the substring is a null-terminated character string.
All three overloads are equivalent to returnfind(x)!=npos;, where x is the parameter.
Parameters
sv - a string view c - a single character s - a null-terminated character string Return value
true if the string view contains the provided substring, false otherwise.
Notes
macroValueStdFeature
(C++23)contains functions Example
Run this code
#include<string_view>usingnamespacestd::literals;static_assert(// bool contains(basic_string_view x) const noexcept;"https://cppreference.com"sv.contains("cpp"sv)==trueand"https://cppreference.com"sv.contains("php"sv)==falseand// bool contains(CharT x) const noexcept;"C++23"sv.contains('+')==trueand"C++23"sv.contains('-')==falseand// bool contains(const CharT* x) const;std::string_view("basic_string_view").contains("string")==trueandstd::string_view("basic_string_view").contains("String")==false);intmain(){}See also
(C++20)
checks if the string view starts with the given prefix
(public member function)
(C++20)
checks if the string view ends with the given suffix
(public member function)
find characters in the view
(public member function)
returns a substring
(public member function)
(C++23)
checks if the string contains the given substring or character
(public member function of std::basic_string<CharT,Traits,Allocator>)