Regualar Expression in aspNet

<script type="text/javascript" language="javascript" >
    function SoloNumeri(e)
    {
        var keynum;
        var checker = new RegExp("\\d|[.,]");    
        
        if(window.event) // IE
        {
            keynum = e.keyCode;
            window.event.returnValue = checker.test(String.fromCharCode(keynum));
        }
        else if(e.which)
        {   
            // Netscape/Firefox/Opera
            keynum = e.which;
            if(keynum == 8) //--- back o spazio 
                return true; 
            else
                return checker.test(String.fromCharCode(keynum));
        }
    }
</script> 
<input id="pp" onkeypress="SoloNumeri(event)"  />

var checker = new RegExp("[^&*@]");