function RegularExpressionValidatorEvaluateIsValid_Z(controltovalidate, validationexpression) {
    var value = ValidatorGetValue(controltovalidate);
    if (ValidatorTrim(value).length == 0)
        return true;        
    var rx = new RegExp(validationexpression);
    var matches = rx.exec(value);
    return (matches != null && value == matches[0]);
}											
function ValidatorGetValue(id) {
    var control;
    control = document.all[id];
    if (typeof(control.value) == "string") {
        return control.value;
    }
    if (typeof(control.tagName) == "undefined" && typeof(control.length) == "number") {
        var j;
        for (j=0; j < control.length; j++) {
            var inner = control[j];
            if (typeof(inner.value) == "string" && (inner.type != "radio" || inner.status == true)) {
                return inner.value;
            }
        }
    }
    else {
        return ValidatorGetValueRecursive(control);
    }
    return "";
}
function ValidatorGetValueRecursive(control)
{
    if (typeof(control.value) == "string" && (control.type != "radio" || control.status == true)) {
        return control.value;
    }
    var i, val;
    for (i = 0; i<control.children.length; i++) {
        val = ValidatorGetValueRecursive(control.children[i]);
        if (val != "") return val;
    }
    return "";
}
function ValidatorTrim(s) {
    var m = s.match(/^\s*(\S+(\s+\S+)*)\s*$/);
    return (m == null) ? "" : m[1];
}