Şu anda tam olarak bitmemiş olsa da renklendirme kodum şu şekilde gidiyor: ActionScript(AS3):

var styleReq:URLRequest = new URLRequest("color.xml");
var styleLoader:URLLoader = new URLLoader(styleReq);
var styleXml:XML;
styleLoader.addEventListener(Event.COMPLETE,attachStyle);
function attachStyle(e:Event)
{
    styleXml = new XML(e.target.data);
    colorText(fileTxt);
}
fileTxt.addEventListener(Event.CHANGE,handleTxtChange);
function handleTxtChange(e:Event)
{
    //colorText(fileTxt);
}
function colorText(obj)
{
    var plainTxt:String = obj.text;
    var htmlTxt:String = obj.htmlText;;
    //Replace Var
    var colors:Object = styleXml.child("clr");
    var strReg:RegExp = /".*?"/gm
    //var comReg:RegExp = /
    for(var clrKey:* in colors){
    var regs:Object = colors[clrKey].child("reg");
    for (var regKey:* in regs) {
        var reg:RegExp = new RegExp(regs[regKey],"g");
        var newText:String = plainTxt.replace(reg,"<font color='"+colors[clrKey].attribute("color")+"'>"+regs[regKey]+"</font><FONT COLOR='#000000'>");
        newText = newText.replace(strReg,"<font color='#009900'>"+strReg.exec(plainTxt)+"</font><FONT COLOR='#000000'>");
        obj.htmlText = newText
    }
    }
}

XML:

<root>
<clr color='#0000FF'>
<reg>var</reg>
</clr>
</root>