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源代码：
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<HTML> <HEAD></HEAD> <FONT FACE="Verdana, Arial, Helvetica" SIZE=2> <FONT COLOR=#0000ff><script runat="server"> sub submit(sender As Object, e As EventArgs) if Page.IsValid then lbl.Text="The page is valid!" else lbl.Text="The page is not valid!" end if end sub </script></FONT> <!DOCTYPE html> <html> <body> <form runat="server"> Enter a US zip code: <asp:TextBox id="txtbox1" runat="server" /> <br><br> <asp:Button text="Submit" OnClick="submit" runat="server" /> <br><br> <asp:Label id="lbl" runat="server" /> <br> <asp:RegularExpressionValidator ControlToValidate="txtbox1" ValidationExpression="\d{5}" EnableClientScript="false" ErrorMessage="The zip code must be 5 numeric digits!" runat="server" /> </form> </body> </html> </HTML>
运行结果
Enter a US zip code: