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RegExpValidator matches text against a RegEx pattern

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:RegExpValidator source="{ssn}"                          property="text"                          flags="gmi"                         expression="\d\{3\}.\d\{2\}.\d\{4\}"                         noMatchError="Your SSN is unrecognized."                          trigger="{submitButton}"                         triggerEvent="click" />     <mx:Text text="Social Security Number:" />     <mx:TextInput id="ssn" />     <mx:Button label="Submit" id="submitButton" /> </mx:Application>