D语言索引方法

import std.stdio;
import std.string;

void main() { 
   char[] s1 = "hello World ".dup; 

   writeln("indexOf of llo in hello is ",std.string.indexOf(s1,"llo")); 
   writeln(s1); 
   writeln("lastIndexOf of O in hello is " ,std.string.lastIndexOf(s1,"O",CaseSensitive.no));
}