Validation Server Controls->ASP.NET RegularExpressionValidator Control
Definition and Usage
The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern.
Note: Both server- and client-side validation are performed unless the browser does not support client-side validation or the EnableClientScript property is set to false.
Note: The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required.
Properties
| Property | Description |
|---|---|
| BackColor | The background color of the RegularExpressionValidator control |
| ControlToValidate | The id of the control to validate |
| Display | The display behavior for the validation control. Legal values are:
|
| EnableClientScript | A Boolean value that specifies whether client-side validation is enabled or not |
| Enabled | A Boolean value that specifies whether the validation control is enabled or not |
| ErrorMessage | The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set |
| ForeColor | The foreground color of the control |
| id | A unique id for the control |
| IsValid | A Boolean value that indicates whether the control specified by ControlToValidate is determined to be valid |
| runat | Specifies that the control is a server control. Must be set to "server" |
| BackColor | The background color of the RegularExpressionValidator control |
| Text | The message to display when validation fails |
| ValidationExpression |
Specifies the expression used to validate input control. The expression validation syntax is different on the client than on the server. JScript is used on the client. On the server, the language you have specified is used |
Examples
RegularExpressionValidator
ASPX Source:
| <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> <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> |
Output Result:
| Enter a US zip code: |
IF you enter a US zip code "215300" and the click the button "Submit",,it will show:
| Enter a US zip code: The page is not valid! The zip code must be 5 numeric digits! |
IF you enter a US zip code "21530" and the click the button "Submit",it will show:
| Enter a US zip code: The page is valid! |
In this example we declare one TextBox control, one Button control, one Label control, and one RegularExpressionValidator control in an .aspx file. The submit() function checks if the page is valid. If it is valid, it returns "The page is valid!" in the Label control. If it is not valid, it returns "The page is not valid!" in the Label control. If validation fails, the text "The zip code must be 5 numeric digits!" will be displayed in the RegularExpressionValidator control.
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