Definition and Usage

The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern.

Note: The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required.

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Properties

Property	Value	Description
Alignment	left center right	Optional. How to align the control
BackColor	rgb(x,x,x) #xxxxxx colorname	Optional. A background color for the control
ControlToValidate	id_of_target_control	Optional. The id of the control to validate
Display	None Static Dynamic	Optional. The display behavior for the validation control. Legal values are: None (the control is not displayed. Used to show the error message only in the ValidationSummary control) Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation Dynamic is default
ErrorMessage	errortext_for_summary	Optional. The text to display in the ValidationSummary control when validation fails
ForeColor	rgb(x,x,x) #xxxxxx colorname	Optional. A foreground color for the control
Font-Bold	false true	Optional. Specifies whether or not the text in the control should be bold
Font-Italic	false true	Optional. Specifies whether or not the text in the control should be italic
Font-Name	fontname	Optional. Specifies the font name of the text in the control
Font-Size	normal small large	Optional. Specifies the font size of the text in the control
id	unique_name	Optional. A unique id for the control
runat	"server"	Required. Specifies that the control is a server control
StyleReference	name_of_style_element	Optional. Specifies a reference to a style to be applied to the control
Text	errortext	Optional. The message to display when validation fails
ValidationExpression	regexp	Optional. Specifies the pattern/expression assigned to be the validation criteria
Wrapping	wrap nowrap	Optional. Specifies whether or not the text in the control should wrap

Example 1

The following example contains two forms in an .aspx file. The first form has a label with the text "Please enter a ZIP code", an input box to input a ZIP code, a RegularExpressionValidator control that checks that the input value contains exactly five digits, a RequiredFieldValidator control that checks that the input field isn't empty, and a submit button. The second page is activated by the submit button on the first page, and displays a response. If the input value validates as an error, an error message is displayed:

<%@ Page Inherits="System.Web.UI.MobileControls.MobilePage"%> <%@ Register TagPrefix="Mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile" %> <script runat="server"> sub page2(Sender as Object,E as EventArgs) if Page.IsValid then   ActiveForm=f2   lbl2.Text="The ZIP code entered is: " & txt1.text end if end sub </script> <Mobile:Form id="f1" runat="server">   <Mobile:Label runat="server">   Please enter a ZIP code   </Mobile:Label>   <Mobile:TextBox id="txt1" runat="server"/>   <Mobile:RegularExpressionValidator   ControlToValidate="txt1"   ValidationExpression="\d{5}"   Text="The zip code must be five digits!"   runat="server" />   <Mobile:RequiredFieldValidator   ControlToValidate="txt1"   Text="A ZIP code is required!"   runat="server" />   <Mobile:Command runat="server"   OnClick="page2">Submit   </Mobile:Command> </Mobile:Form> <Mobile:Form id="f2" runat="server">   <Mobile:Label id="lbl2" runat="server" /> </Mobile:Form>

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