Use split method to get the file name and its extension name

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){


        var filename:String = "document.jpg";
        var nameParts:Array = filename.split(".");
        
        var extensionless:String = nameParts[0];
        trace ("The filename is " + extensionless);
        
        var extension:String = nameParts[1];
        trace ("The file extension is " + extension);

    }
  }
}

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Use split method to get the file name and its extension name : split « String « Flash / Flex / ActionScript

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