#include "string.h"
char *strstr( char *str1, char *str2 );The function strstr() returns a pointer to the first occurrence
of str2 in str1, or NULL if no match is found. If the length of
str2 is zero, then strstr() will simply return str1.
For example, the following code checks for the existence of one
string within another string:
char* str1 = "this is a string of characters";
char* str2 = "a string";
char* result = strstr( str1, str2 );
if( result == NULL ) printf( "Could not find '%s' in '%s'\n", str2, str1 );
else printf( "Found a substring: '%s'\n", result );When run, the above code displays this output:
Found a substring: 'a string of characters'