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strspn

Usage

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

   ANSI

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>
   #include <stdlib.h>

   char *string = "Example";
   char *cmp = "aEx";

   int main()
   {
       int result;
       printf("Length of string in [%s] ",string);
       printf("containing [%s] characters\n",cmp);

       printf("strspn is [%d]\n",strspn(string,cmp));
       return EXIT_SUCCESS;
   }