strstr

Locates the first occurrence in the string pointed to by s1 of the sequence of characters in the string pointed to by s2.

Format

#include  <string.h>

char *strstr  (const char *s1, const char *s2);

Arguments

s1, s2

Pointers to character strings.

Return Values

Pointer	A pointer to the located string.
NULL	Indicates that the string was not found.

Example

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

main()
    {
    static char lookin[]="that this is a test was at the end";

    putchar('\n');
    printf("String: %s\n", &lookin[0] );
    putchar('\n');
    printf("Addr: %s\n", &lookin[0] );
    printf("this: %s\n", strstr( &lookin[0] ,"this") );
    printf("that: %s\n", strstr( &lookin[0] , "that" ) );
    printf("NULL: %s\n", strstr( &lookin[0], "" ) );
    printf("was: %s\n", strstr( &lookin[0], "was" ) );
    printf("at: %s\n", strstr( &lookin[0], "at" ) );
    printf("the end: %s\n", strstr( &lookin[0], "the end") );
    putchar('\n');

    exit();
    };

This example produces the following results:

$ RUN STRSTR_EXAMPLE
String: that this is a test was at the end
Addr: that this is a test was at the end
this: this is a test was at the end
that: that this is a test was at the end
NULL: that this is a test was at the end
was: was at the end
at: at this is a test was at the end
the end: the end
$