JavaScript Field validater

The following is a validate which use Javascript regularexpress to implement. The part to revoke javascript function is “ onchange=”regcheckTimeSeconds(this);

The regular express patter could find at the site:

Front page code.

<asp:TemplateField HeaderText="From">
	<FooterStyle HorizontalAlign="Right" />
	<HeaderStyle HorizontalAlign="Left" Width="120px" />
	<ItemStyle CssClass="" HorizontalAlign="Left" Width="120px" VerticalAlign="Top" />
		<asp:Button ID="btnTime1" Text="T" runat="server" OnClick="gdEdit_TimeSet" />
		<asp:Button ID="btnTime2" Text="-" runat="server" OnClick="gdEdit_TimeSet" />
		<asp:Button ID="btnTime3" Text="+" runat="server" OnClick="gdEdit_TimeSet" />
		<br />
		<asp:TextBox ID="txtTimeFrom" Width="80px" Text='<%# Eval("TimeStart", "{0:T}").ToString.ToLower %>' onchange="regcheckTimeSeconds(this);" AutoPostBack="false" TabIndex="20" runat="server" />


JavaScript code

	function regcheckTimeSeconds(txtbox) {
        var s = txtbox.value
        //var reg = new RegExp("^((([0]?[1-9]|1[0-2])(:|\.)[0-5][0-9]((:|\.)[0-5][0-9])?( )?(AM|am|aM|Am|PM|pm|pM|Pm))|(([0]?[0-9]|1[0-9]|2[0-3])(:|\.)[0-5][0-9]((:|\.)[0-5][0-9])?))$");
        //var reg = new RegExp("^((([0]?[1-9]|1[0-2])(:|\.)[0-5][0-9]((:|\.)[0-5][0-9])?( )?(AM|am|aM|Am|PM|pm|pM|Pm))|(([0]?[0-9]|1[0-9]|2[0-3])(:|\.)[0-5][0-9]((:|\.)[0-5][0-9])?))$");

        // var reg = new RegExp("^([1-9]|1[0-2]|0[1-9]){1}(:[0-5][0-9](\:[0-5][0-9]\s?[aApP][mM])){1}$");
        var reg = new RegExp("^(1[0-2]|[1-9]):[0-5][0-9]:[0-5][0-9][ ]?[aApP][mM]$");

	    if ((/^\s*$/).test(s)) {
            if (String(s).search(reg) == -1) {
       = "red";
                alert("The time format is incorrect.\r\n\r\nThe correct format is:\r\nHH:MM:SS am/pm\r\n\r\nFor example:\r\n11:41:55 pm");
            } else {
       = "black";


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