validate character in aspx page using javascript

STEP-->1
add this javascript function in aspx page


<script language="javascript" type="text/javascript">
        function validateLimit(obj, divID, maxchar) {

            objDiv = get_object(divID);

            if (this.id) obj = this;

            var remaningChar = maxchar - trimEnter(obj.value).length;

            if (objDiv.id) {
                objDiv.innerHTML = remaningChar + " characters left";
            }
            if (remaningChar <= 0) {
                obj.value = obj.value.substring(maxchar, 0);
                if (objDiv.id) {
                    objDiv.innerHTML = "0 characters left";
                }
                return false;
            }
            else
            { return true; }
        }
        function get_object(id) {
            var object = null;
            if (document.layers) {
                object = document.layers[id];
            } else if (document.all) {
                object = document.all[id];
            } else if (document.getElementById) {
                object = document.getElementById(id);
            }
            return object;
        }
        function trimEnter(dataStr) {
            return dataStr.replace(/(\r\n|\r|\n)/g, "");
        }
    </script>

STEP--> 2
assign javascript function to onkeyup event


 <asp:TextBox ID="yourtestboxid" runat="server" onkeyup="return validateLimit(this, 'lblMsg1', 50)"></asp:TextBox>
                                             
<div id="lblMsg1"> 50 characters left</div>==>this is displaying remaining character in aspx page

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Follow the link everything is working fine

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 <asp:RegularExpressionValidator ID="RegularExpressionValidator16" runat="server" ControlToValidate="Phone1"  Display="Dynamic"                                          ValidationExpression="^[+]?\d{9,12}$" ErrorMessage="Invalid"></asp:RegularExpressionValidator>

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