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RegularExpressionValidator Control

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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.


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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