Try this:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute">
<mx:Script>
    <![CDATA[
        public function onChange(event:Event):void
        {
            if(t1.text.length>0)
            {
                t1.restrict="[0-9][a-z][A-Z]";
            }
            else if(t1.text.length<t1.text.length+1)
            {
                t1.restrict="[a-z][A-Z]";
            }
        }
    ]]>
</mx:Script>
    <mx:Label x="41" y="130" text="Enter Text Here   :" width="167"
height="26" fontFamily="Georgia" fontSize="15" fontWeight="bold"/>
    <mx:TextInput x="192" y="130" height="25" width="190" id="t1"
creationComplete="onChange(event)" change="onChange(event)"/>
</mx:Application>


Veeru
ITON Technologies

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