# SDL_wcsstr Search a wide string for the first instance of a specific substring. ## Header File Defined in [](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h) ## Syntax ```c wchar_t * SDL_wcsstr(const wchar_t *haystack, const wchar_t *needle); ``` ## Function Parameters | | | | | --------------- | ------------ | ------------------------------------------------ | | const wchar_t * | **haystack** | the wide string to search. Must not be NULL. | | const wchar_t * | **needle** | the wide string to search for. Must not be NULL. | ## Return Value (wchar_t *) Returns a pointer to the first instance of `needle` in the string, or NULL if not found. ## Remarks The search ends once it finds the requested substring, or a null terminator byte to end the string. Note that this looks for strings of _wide characters_, not _codepoints_, so it's legal to search for malformed and incomplete UTF-16 sequences. ## Thread Safety It is safe to call this function from any thread. ## Version This function is available since SDL 3.2.0. ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)