std:: wcschr

From cppreference.com
C++
Strings library
Null-terminated wide strings
Defined in header <cwchar>
const wchar_t * wcschr ( const wchar_t * str, wchar_t ch ) ;
wchar_t * wcschr ( wchar_t * str, wchar_t ch ) ;

Finds the first occurrence of the wide character ch in the wide string pointed to by str .

Parameters

str - pointer to the null-terminated wide string to be analyzed
ch - wide character to search for

Return value

Pointer to the found character in str , or a null pointer if no such character is found.

Example

Run this code 
#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    const wchar_t arr[] = L"白猫 黒猫 кошки";
    const wchar_t* cat = std::wcschr(arr, L'猫');
    const wchar_t* dog = std::wcschr(arr, L'犬');
 
    std::cout.imbue(std::locale("en_US.utf8"));
 
    if (cat)
        std::cout << "The character 猫 found at position " << cat - arr << '\n';
    else
        std::cout << "The character 猫 not found\n";
 
    if (dog)
        std::cout << "The character 犬 found at position " << dog - arr << '\n';
    else
        std::cout << "The character 犬 not found\n";
}

Output: 

The character 猫 found at position 1
The character 犬 not found

See also

finds the first occurrence of the given substring
(public member function of std::basic_string<CharT,Traits,Allocator> )
finds the first occurrence of a character
(function)
finds the last occurrence of a wide character in a wide string
(function)
finds the first location of any wide character in one wide string, in another wide string
(function)
C documentation for wcschr
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