源代码:
<html> <body> <form runat="server"> Enter a US zip code: <asp:TextBox id="txtbox1" runat="server" /> <asp:Button text="Submit" OnClick="submit" runat="server" /> <asp:Label id="lbl" runat="server" /> <asp:RegularExpressionValidator ControlToValidate="txtbox1" ValidationExpression="d{5}" EnableClientScript="false" ErrorMessage="The zip code must be 5 numeric digits!" runat="server" /> </form> </body> </html>
运行结果：
<html> <body> <form runat="server"> Enter a US zip code: <asp:TextBox id="txtbox1" runat="server" /> <asp:Button text="Submit" OnClick="submit" runat="server" /> <asp:Label id="lbl" runat="server" /> <asp:RegularExpressionValidator ControlToValidate="txtbox1" ValidationExpression="d{5}" EnableClientScript="false" ErrorMessage="The zip code must be 5 numeric digits!" runat="server" /> </form> </body> </html>