CRM 2013 Javascript Validate Symbol

Script:

function validateSymbol(Field) {
    var TCode = Xrm.Page.getAttribute(Field).getValue();

    if (/[^a-zA-Z0-9\-\/]/.test(TCode)) {
        alert("Input is not alphanumeric");
        Xrm.Page.getAttribute(Field).setValue(null);
    }
}