Email validation in Actionscript 3

var ampPos:int = emailStr.indexOf("@");
if (ampPos == -1)

/* https://stimuli.com.br/, Arthur Debert
*/
package br.com.stimuli.mona.validators{
    /*// usage
    * import br.com.stimuli.mona.validators.EmailValidator;
    * 
    * // will return a boolean
    * EmailValidator.isValidEmail("");
    * 
    * // if you'd rather validate an catch an error you can use:
    * EmailValidator.validate("");
    * 
    * // You can also specify which class you;d rather throw an error in case the email isn't valid:
    * EmailValidator.validate("bad@", MyErrorClass);
    * 
    * // You can also specify the message to be passed to the error class
    * EmailValidator.validate("bad@", Error, "Bad email!");
    * 
    * // If you have an input where people can type a few email addresses you can validate a whole list
    * // This will separate and trim each word of text:
    * EmailValidator.isValidEmailList(", ");
    * 
    * // If you specify an arbitrary separator to test. This will return true:
    * EmailValidator.isValidEmailList(";  ", ";");
    * // But using the default (",") separator, this will return false:
    * EmailValidator.isValidEmailList(";  ",);
    */
    public class EmailValidator{

        public function EmailValidator() {
            throw new Error("The EmailValidator class is not intended to be instantiated.");
        }
        
        // permissive, will allow quite a few non matching email addresses
        public static const EMAIL_REGEX : RegExp = /^[A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}$/i;

        /** Checks if the given string is a valid email address.
        *   email The email address as a String
        *   True if the given string is a valid email address, false otherwise.
        */
        public static function isValidEmail(email : String) : Boolean{
            return Boolean(email.match(EMAIL_REGEX));
        }
        
        /* Splits a string with the separator character, strips white characters and checks if all of them are valid
        */
        public static function isValidEmailList(emailList : String, separator : String = ",") : Boolean{
            var addresses : Array = emailList.split(separator);
            for each (var email : String in addresses){
                if (!isValidEmail(email.replace(/\s/, "")))return false;
            }
            return true;
        }
        
        public static function validate(email : String, errorClass : Class = null, errorMessage : String = "Invalid e-mail address.") : void{
            if (isValidEmail(email) )return;
            errorClass = errorClass || Error;
            throw new errorClass(errorMessage)
        }
    }
}