Actionscript 3 :: Loading A Class Using GetDefinition()

What I am trying to do is to use shared runtime library by loading a swf ('index.swf') which has numerous library objects which are named in sequence such as:

(orange1,orange2,orange3,orange4)
(red1,red2,red3,red4)

I am able to load the swf('index.swf') without any issues and even am able to load the right library asset, but I have to declare the full name as string such as getDefinition('orange1'). What I would like to do is to match first three letters of string and then run a for loop to load up all the classes that match the first three letters. I usually can do this by employing indexOf() method.

here is my code:

public function loadContent():void
{
ldr.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progressHandler);
ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onloadHandler);

[Code]....