asp:RegularExpressionValidator for Time Validation

asp:RegularExpressionValidator for time validation where minutes can be only 00 or 30

Examples:

09:30, 9:30, 23:00 (Pass)

09:31, 9:31, 23:05 (Fail)

<asp:RegularExpressionValidator id="FromTimeValidator" runat="server" ErrorMessage="* Please enter in correct format for Time." Display="Dynamic" ControlToValidate="FromTimeTb" ValidationExpression="^(([0-9])|([0-1][0-9])|([2][0-3])):(([0,3])|([0,3][0]))$" ValidationGroup="tcc">asp:RegularExpressionValidator>

HTML 5 Game

I was browsing some stuff for HTML 5 and came through to this game page it's awsome here is a link.