<?xml version="1.0" encoding="utf-8"?>
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
     backgroundColor="#FFFFFF" width="400" height="150">
    <mx:Script>
      <![CDATA[
        import mx.events.ValidationResultEvent;
        import mx.validators.EmailValidator;
                                                  
                          private var isValid:Boolean;
        public var emailValidator:EmailValidator = new EmailValidator();
        public var validator:ValidationResultEvent;
  
        public function validate():void {
          // set validators source
          emailValidator.source = email;
          // set validators property
          emailValidator.property = "text";
          // call validate()
          validator = emailValidator.validate();
          if (validator.type==ValidationResultEvent.VALID)                 {
            isValid = true;
          } else {
            isValid = false;
          }
        }
      ]]>
    </mx:Script>
    <mx:Panel title="Validate with ActionScript" width="210" height="75">
      <mx:HBox width="100%" height="100%" paddingLeft="3" paddingTop="3">
        <mx:TextInput id="email" width="100"/>
        <mx:Button label="Validate" click="validate()" />
      </mx:HBox>
    </mx:Panel>
  </mx:Application>