Hi,

<fx:Script>
<![CDATA[
 protected var regExp:RegExp = /_[a-z]|[A-Z]/;
 protected function onClick(event:MouseEvent):void
{
trace(regExp.test(myText.text))
}
]]>
</fx:Script>
 <fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
 <s:TextInput id="myText" />
<s:Button x="0" y="34" label="CLICK" click="onClick(event)"/>

I Think This will help u in validating the requirements which u mentioned
previously.

Regards

Dinesh kumar.L

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