Mega Code Archive
Use Email validator
<![CDATA[
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:EmailValidator id="emailValidator" source="{emailTextInput}"
property="text"
requiredFieldError="Please enter your email. "
triggerEvent="change" />
<mx:TextInput id="emailTextInput" />
</mx:Application>
]]>