Convert as2 to as3

Question

I found a script for searching and selecting a specific text from a dynamic text box

But the problem is it is AS2

I started Flash by only studying AS3 so i have no idea on how to convert AS2 to AS3 Pls someone help me :)

finder.onRelease = function() {
       Selection.setFocus("_root.textInstance");
       var inputterString:String = _root.inputter
       var inputLength:Number = inputterString.length;
       textStart = textVar.indexOf(inputter, 0);
       if (inputLength>0) {
             textEnd = textStart+inputLength;
       } else {
             textEnd = 0;
       }
       if (textStart>=0) {
             Selection.setSelection(textStart, textEnd);
       } else {
             Selection.setSelection(0, 0);
       }
       _root.textEnd = textEnd;
};

findNext.onRelease = function() {
       Selection.setFocus("_root.textInstance");
       var inputterString:String = _root.inputter;
       var inputLength:Number = inputterString.length;
       textStart = textVar.indexOf(inputter, _root.textEnd);
       if (inputLength>0) {
             textEnd = textStart+inputLength;
       } else {
             textEnd = 0;
       }
       if (textStart>=0) {
             Selection.setSelection(textStart, textEnd);
       } else {
             Selection.setSelection(0, 0);
       }
       _root.textEnd = textEnd;
}

Answer 1

It's not as bad as you might think, but what are finder and findNext - buttons? These are callbacks which can be created by

finder.addEventListener(MouseEvent.MOUSE_UP, finderCallback);

// somewhere else in the code

private function finderCallback(e:MouseEvent):void {
   // code here

   // anything like _root.<varName> references something on the main file, 
   // so this just has to be something you can access in the funciton
}

Answer 2

OK, this should be it. I made some assumptions about root.textInstance and the buttons.

import flash.events.MouseEvent;

function onFinderClicked(event:MouseEvent):void{
    stage.focus = root.textInstance;
    root.textInstance.selectable = true;
     var inputterString:String = root.inputter
     var inputLength:Number = inputterString.length;
     textStart = textVar.indexOf(inputter, 0);
     if (inputLength>0) {
         textEnd = textStart+inputLength;
     } else {
         textEnd = 0;
     }
     if (textStart>=0) {
         root.textInstance.setSelection(textStart, textEnd);
     } else {
         root.textInstance.setSelection(0, 0);
     }
     root.textEnd = textEnd;
};


function onFindNextClicked(event:MouseEvent):void{
    stage.focus = root.textInstance;
    root.textInstance.selectable = true;
    var inputterString:String = root.inputter;
    var inputLength:Number = inputterString.length;
    textStart = textVar.indexOf(inputter, root.textEnd);
    if (inputLength>0) {
         textEnd = textStart+inputLength;
    } else {
         textEnd = 0;
    }
    if (textStart>=0) {
         root.textInstance.setSelection(textStart, textEnd);
    } else {
         root.textInstance.setSelection(0, 0);
    }
    root.textEnd = textEnd;
}

finder.addEventListener(MouseEvent.CLICK, onFinderClicked);
findNext.addEventListener(MouseEvent.CLICK, onFindNextClicked);