<?xml version="1.0" encoding="utf-8"?>
  <!-- Simple example to demonstrate StringValidator. -->
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  
      <mx:Script>
          import mx.controls.Alert;
      </mx:Script>
  
      <mx:StringValidator source="{fname}" property="text" 
              tooShortError="This string is shorter than the minimum allowed length of 4. " 
              tooLongError="This string is longer than the maximum allowed length of 20." 
              minLength="4" maxLength="20"  
              trigger="{myButton}" triggerEvent="click" 
              valid="Alert.show('Validation Succeeded!');"/>
  
      <mx:Panel title="StringValidator Example" width="75%" height="75%" 
          paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">
  
              <mx:Form>               
                              <mx:FormItem label="Enter a name between 4 and 20 characters: ">
                      <mx:TextInput id="fname" width="100%"/>
                  </mx:FormItem>
  
                  <mx:FormItem >
                      <mx:Button id="myButton" label="Validate" />
                  </mx:FormItem>
              </mx:Form>        
      </mx:Panel>
  </mx:Application>