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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../string/wide/wcsstr.html below:

std::wcsstr - cppreference.com

const wchar_t* wcsstr( const wchar_t* dest, const wchar_t* src );

      wchar_t* wcsstr(       wchar_t* dest, const wchar_t* src );

Finds the first occurrence of the wide string src in the wide string pointed to by dest. The terminating null characters are not compared.

[edit] Parameters dest - pointer to the null-terminated wide string to examine src - pointer to the null-terminated wide string to search for [edit] Return value

Pointer to the first character of the found substring in dest, or a null pointer if no such substring is found. If src points to an empty string, dest is returned.

[edit] Example 
#include <clocale>
#include <cwchar>
#include <iostream>
 
int main()
{
    wchar_t const* origin = L"アルファ, ベータ, ガンマ, アルファ, ベータ, ガンマ.";
    wchar_t const* target = L"ベータ";
    wchar_t const* result = origin;
 
    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout << L"Substring to find: \"" << target << L"\"\n"
               << L"String to search: \"" << origin << L"\"\n\n";
 
    for (; (result = std::wcsstr(result, target)) != nullptr; ++result)
        std::wcout << L"Found: \"" << result << L"\"\n";
}

Possible output:

Substring to find: "ベータ"
String to search: "アルファ, ベータ, ガンマ, アルファ, ベータ, ガンマ."
 
Found: "ベータ, ガンマ, アルファ, ベータ, ガンマ."
Found: "ベータ, ガンマ."
[edit] See also finds the first occurrence of the given substring
(public member function of std::basic_string<CharT,Traits,Allocator>) [edit] finds the first occurrence of a substring of characters
(function) [edit] finds the first occurrence of a wide character in a wide string
(function) [edit] finds the last occurrence of a wide character in a wide string
(function) [edit]

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