Eval mathematical Expression using AS3

The below code is example for how to use MathParser.as used for evaluating maths expressions using flex. Inspired from flashmaths

<?xml version=”1.0″ encoding=”utf-8″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml” backgroundColor=”#333333″ creationComplete=”calculate()”>
<mx:Script>
<![CDATA[
[Bindable]
private var evalStr:String;
private var mpExp:MathParser = new MathParser([ ]);
private function calculate ():void {
var compobjVal:Object = mpExp.doCompile(mathStr.text);
evalStr = String(mpExp.doEval(compobjVal.PolishArray, []));
}
]]>
</mx:Script>
<mx:TextInput id=”mathStr” text=”((7*(1-8))*9)-6+7″ change=”calculate()” />
<mx:Text id=”resVal” color=”White” text=”{evalStr}” />
</mx:Application>

RegExp Validation

The below function validates the email ID string using regular expression.

private function validateEmail(mailid:String):Boolean {
        var emailExpression:RegExp = /^[a-z][\w.-]+@\w[\w.-]+\.[\w.-]*[a-z][a-z]$/i;
        return emailExpression.test(mailid);
}

//e-mail option 2:

/[a-zA-Z0-9!$&*.=^`|~#%'+\/?_{}-]+@([\w_-]+\.)+[a-zA-Z]{2,4}/;

//URL:

/(https?|ftp|svn)(:\/\/[\w-_.:;!?~*\'()\/\@&=+\$,%#]+)/;

//Color:

/#([0-9a-fA-F]{6}|[0-9a-fA-F]{3})/;

//String Quote:

/(“|’)(.+)?\1/;

IP evaluation:

var ipPattern:RegExp = /\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/;