The below code shows how to use the class

import druva.emailValidator;

trace('druva.flash@gmail.com > '+emailValidator.isValidEmail('druva.flash@gmail.com'));
// true
trace('druva.flash@gmail > '+emailValidator.isValidEmail('druva.flash@gmail'));
// false
trace('druva.@.com > '+emailValidator.isValidEmail('druva.@.com'));
//false
trace('druva.@gmail.com > '+emailValidator.isValidEmail('druva.@gmail.com'));
//true
trace('.aa@gmailcom > '+emailValidator.isValidEmail('.aa@gmailcom'));
//false

This is the actual class for validation

package druva {
  import flash.display.Sprite;

  public class emailValidator extends Sprite{
    public function emailValidator(){
    }

	public static function isValidEmail(email:String):Boolean {
		var emailExpression:RegExp = /^[a-z][\w.-]+@\w[\w.-]+\.[\w.-]*[a-z][a-z]$/i;
		return emailExpression.test(email);
	}

var b:Button = new Button();
b.label = 'openNewWindow';
addChild(b);
b.addEventListener(MouseEvent.MOUSE_DOWN, OpenPopUpWindow);
function OpenPopUpWindow(e:MouseEvent):void {
  var result:String = ;
  var url:URLRequest = new URLRequest("javascript:window.open('http://www.totusinfo.com','win','height=800,
           width=800,toolbar=yes,scrollbars=yes');void(0);");
  navigateToURL(url, "_self");
}