C strstr() Function

strstr() searches for a substring in a string. It returns a pointer to the first place where it is found, or NULL if it is not found.

Syntax

char *strstr(const char *text, const char *sub);

Example

#include <stdio.h>
#include <string.h>

int main(void) {
    char text[] = "I am learning C programming";
    char *p = strstr(text, "learning");

    if (p != NULL) {
        printf("Found: %s\n", p);
        printf("Position: %ld\n", p - text);
    } else {
        printf("Not found\n");
    }
    return 0;
}

Output:

p - text is the number of characters before the match, so it gives the index (starting from 0).

When the word is missing

#include <stdio.h>
#include <string.h>

int main(void) {
    char *p = strstr("Hello World", "Java");

    if (p == NULL) {
        printf("Not found\n");
    }
    return 0;
}

Output:

Next: Reverse a String in C.

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