# wcsstr

From cppreference.com
< c‎ | string‎ | wide

Defined in header `<wchar.h>` |  |
wchar_t* wcsstr( const wchar_t* dest, const wchar_t* src ); |  | (since C95)

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

### Parameters

dest | - | pointer to the null-terminated wide string to examine
src | - | pointer to the null-terminated wide string to search for

### Return value

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

### Example

Run this code

    #include <stdio.h>
    #include <locale.h>
    #include <wchar.h>

    int main(void) {
        setlocale(LC_ALL, "ru_RU.UTF-8");

        wchar_t str[5][64] = {
            L"Строка, где есть подстрока 'но'.",
            L"Строка, где такой подстроки нет.",
            L"Он здесь.",
            L"Здесь он.",
            L"Его нет."
        };

        for (size_t i = 0; i < 5; ++i) {
            if (wcsstr(str[i], L"но")) {
                wprintf(L"%ls\n", str[i]);
            }
        }
    }

Output:

    Строка, где есть подстрока 'но'.

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.29.4.5.6 The wcsstr function (p: 437)

- C99 standard (ISO/IEC 9899:1999):

  - 7.24.4.5.6 The wcsstr function (p: 383)

### See also

wcschr (C95) | finds the first occurrence of a wide character in a wide string (function)
wcsrchr (C95) | finds the last occurrence of a wide character in a wide string (function)

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