Solution for /r/DailyProgrammer for 6/27/2014 (http://www.reddit.com/r/dailyprogrammer/comments/299hvt/6272014_challenge_168_easy_string_index/)

stringIndex.d

import std.stdio;
import std.regex;
import std.array;
import std.conv;

void main(string[] args) 
{
  if (args.length < 1)
  {
    writeln("No string specified");
  }

  writeln("Enter the string: ");
  string input = readln();

  writeln("Enter indexes to return (space delmited)");
  string indexes = readln();

  string[] index = split(indexes);
  string[] words = split(input,regex("[^a-zA-Z0-9]+"));

  foreach(int i, string idx; index)
  {
    auto x = to!int(idx);
    if ( x > 0 && x < words.length)
    {
      write(words[x]," ");
    }
  }

  writeln("");
  return;
}