cppreference.com > Standard C String and Character > strtok strtok Syntax:
      #include <string.h>
      char *strtok( char *str1, const char *str2 );
The strtok() function returns a pointer to the next "token" in str1, where str2 contains the delimiters that determine the token. strtok() returns NULL if no token is found. In order to convert a string to tokens, the first call to strtok() should have str1 point to the string to be tokenized. All calls after this should have str1 be NULL. For example:
       char str[] = "now # is the time for all # good men to come to the # aid of their country";
       char delims[] = "#";
       char *result = NULL;
       result = strtok( str, delims );
       while( result != NULL ) {
           printf( "result is \"%s\"\n", result );
           result = strtok( NULL, delims );
       }
The above code will display the following output:
       result is "now "
       result is " is the time for all "
       result is " good men to come to the "
       result is " aid of their country"
Related topics: strchr strcspn strpbrk strrchr strspn strstr