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Validating data using ActionScript 3 0

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"     creationComplete="doValidate()">     <mx:Script>                      import mx.validators.*;                          private var phoneV:PhoneNumberValidator;                          private function doValidate():void             {                 phoneV = new PhoneNumberValidator();                 phoneV.source = phoneTxt;                 phoneV.property = "text";                 phoneV.required = true;                 phoneV.allowedFormatChars = "+,-";                              phoneV.allowedFormatChars = "+-";                 phoneV.invalidCharError = "Invalid char.";                 phoneV.wrongLengthError = "Invalid format";                 phoneV.requiredFieldError = "required";                 phoneV.trigger = phoneTxt;                 phoneV.triggerEvent = "change";             }                                      </mx:Script>                           <mx:Form id="myForm">                  <mx:FormHeading label="Insert Data" />                    <mx:FormItem label="Insert Name" required="true">             <mx:TextInput id="nameTxt" />         </mx:FormItem>                  <mx:FormItem label="Insert Surname">             <mx:TextInput id="surnameTxt" />         </mx:FormItem>                        <mx:FormItem label="Insert Phone Number">             <mx:TextInput id="phoneTxt"  />         </mx:FormItem>              </mx:Form> </mx:Application>