C语言库strcspn()函数

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

int main () {
   int len;
   const char str1[] = ABCDEF4960910;
   const char str2[] = 013;

   len = strcspn(str1, str2);

   printf(First matched character is at %d\n, len + 1);

   return(0);
}