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You may find the need to validate for any regular expression. Here is a simple example of a custom validator where you can add any regular expression to validate. You can set your custom error code.

MXML Source:

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ActionScript Class (whiteSpaceValidator.as):


<br /> package<br /> {<br /> import mx.validators.ValidationResult;<br /> import mx.validators.Validator;</p> <p>public class regularExpressionValidator extends Validator<br /> {<br /> private var results:Array;</p> <p>private var _regExp:RegExp;<br /> private var _errorMessage:String;<br /> private var _errorCode:String;</p> <p>public function regularExpressionValidator()<br /> {<br /> super();<br /> }</p> <p>override protected function doValidation(value:Object):Array {</p> <p>// convert to a string.<br /> var inputValue:String = String(value);</p> <p>// clear array.<br /> results = [];</p> <p>// do validation<br /> results = super.doValidation(value);</p> <p>// return if errors.<br /> if(results.length > 0){<br /> return results;<br /> }</p> <p>// the Regular Expression Value.<br /> var pattern:RegExp = _regExp;<br /> var isValid:Boolean = (pattern.exec(inputValue) ? true : false);<br /> // check to see if a character is entered<br /> if(!isValid){<br /> results.push(new ValidationResult(true, null, _errorCode, _errorMessage));<br /> return results;<br /> }</p> <p>return results;<br /> }</p> <p>public function set expression(value:RegExp):void{<br /> _regExp = value;<br /> }</p> <p>public function get expression():RegExp{<br /> return _regExp;<br /> }</p> <p>public function set errorMessage(value:String):void{<br /> _errorMessage = value;<br /> }</p> <p>public function get errorMessage():String{<br /> return _errorMessage;<br /> }</p> <p>public function set errorCode(value:String):void{<br /> _errorCode = value;<br /> }</p> <p>public function get errorCode():String{<br /> return _errorCode;<br /> }<br /> }<br /> }<br />