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                                  strspn

   Usage
   #include <string.h>
   size_t strspn(const char *string1,const char *string2);

   Description
   Returns  the length of the initial segment of string1  which  consists
   entirely of characters found in string2.

   Example
   #include <string.h>
   #include <stdio.h>
   char *string = "Example";
   char *cmp = "aEx";
   main()
   {
   int result;
        printf("Length of string in [%s] containing [%s] \
                  characters\n", string,cmp);
        printf("strspn is [%d]\n",strspn(string,cmp));
   }