var xml:XML = <p>

<img src="images/float_head.jpg" width="100"/>

<IMG SRC="http://www.images.com/float_head.jpg"/>

</p>;

var re:RegExp = /(?<=src=")[^"]+(?=")/gi;

var htmlText:String = xml.toXMLString();

var srcs:Array = htmlText.match(re);

trace(srcs);

// images/float_head.jpg,http://www.images.com/float_head.jpg

// assume both are not valid

htmlText = htmlText.replace(new RegExp(srcs.join("|"), "gi"), "Symbol1");

var tf:TextField = new TextField();

tf.multiline = true;

tf.wordWrap = true;

tf.htmlText = htmlText;

tf.width = 200;

tf.height = 200;

addChild(tf);