Flex/MXML - Restricting input field from getting an input starting with Zero

Question

I've searched across SO, but couldn't able to find anything relevant my requirement.

Basically, I would like to restrict a textinput field from getting any input starting/prefixed with 0 (although 0 can be suffixed).

I knew that we can use the restrict property to do the restriction, and I'm finding it difficult to get a mxml relevant regular expression to handle this.

Any help?

Answer 1

Can you get the text field and do a conditional where if the charCode(0) is zero? Pure AS would look something like this.

    var tf:TextField = new TextField();

    public function Main() 
    {
        tf.addEventListener(KeyboardEvent.KEY_DOWN, onkeydown);
        addChild(tf);
    }


    private function onkeydown(e:Event):void 
    {
        if (tf.text.charAt(0) == "0")
        {
            //Create an alert, snip the text field, cause a stackovereflow.
            //Maybe hack the computer for bitcoins just because.
        }
    }