Set text format by searching the substring in textfield
package{
import flash.display.Sprite;
import flash.text.*;
public class Main extends Sprite{
public function Main(){
var t:TextField = new TextField( );
t.width = 400;
t.text = "This is bold text.";
var regularFormat:TextFormat = new TextFormat( );
regularFormat.bold = false;
t.setTextFormat(regularFormat,
t.text.indexOf("This isn't bold."),
t.length);
addChild(t);
}
}
}
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