Use the lastIndexOf method to get the file extension name
package{ import flash.display.Sprite;
public class Main extends Sprite{ public function Main(){ var filename:String = "document.jpg"; var extensionIndex:Number = filename.lastIndexOf( '.' );
var extension:String = filename.substr( extensionIndex + 1, filename.length ); trace( "The file extension is " + extension );
} } }
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