C库函数 - strcspn()

#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);

}