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ASP.NET Special Character Validation Using RegularExpressionValidator Controls

ASP.NET RegularExpressionValidator is used to check whether or not input value matches a certain pattern. The RegularExpressionValidator control belongs to System.Web.UI.WebControls

Syntax

<asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server"   
ControlToValidate="TextBox4" ErrorMessage="Enter only a-z A-Z 0-9 , . #."   
ValidationExpression="^[a-zA-Z0-9,.# ]*$"></asp:RegularExpressionValidator>

ASP.NET RegularExpressionValidator Control Property

PropertyDescription
ControlToValidateSpecifies control name which needs to be validate.
DisplaySpecifies behavior of the error message.
EnableClientScriptSpecifies whether or not client-side validation is enabled.
EnabledSpecifies whether or not validation control is enabled or not.
ErrorMessageSpecifies error messageto be display in validation summary.
ForeColorSpecifies error message color.
IsValidIndicate if associate control passes validation or not.
SetFocusOnErrorSet focus on associate control if validation fails.
TextSpecifies text to be display if validation fails.
ValidationGroupSpecifies validation group name.
ValidateUpdate the isvalid propery.
ValidateGetValidationPropertyDetermineing validation property of a control, if it exists.
ValidationExpressionSpecifies regular expression that you want to match against input value.

ASP.NET Special Character Validation Using RegularExpressionValidator Controls Example

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.NET Special Character validation using RegularExpressionValidator Example</title>
</head>
<body>
<form id="Form" runat="server">  
<div style="width: 619px">  
<asp:Label ID="lblTitle" runat="server" Font-Bold="True" Font-Size="Medium"   
Font-Underline="True" Text="ASP.NET Special Character Validation Example"></asp:Label>  <br /><br />
<table border="0" width="500px" cellpadding="0" cellspacing="0">  
<tr><td>  
<asp:Label ID="lblZip" runat="server" Font-Bold="True" Font-Size="Small"   
Text="Enter Text:"></asp:Label>  
<asp:TextBox ID="TextBox4" runat="server" Width="177px"></asp:TextBox>  
<asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server"   
ControlToValidate="TextBox4" ErrorMessage="Enter only a-z A-Z 0-9 , . #."   
ValidationExpression="^[a-zA-Z0-9,.# ]*$"></asp:RegularExpressionValidator>    
</td></tr>  
<tr><td>  
<asp:Button ID="btnSubmit" runat="server" Font-Bold="True"   
Font-Size="Small" Text="Submit" Width="60px" />  
</td></tr>  
</table>     
</div>   
</form>  
</body>  
</html> 

Above example will produce following output

RequiredFieldValidator

RegularExpressionValidator

RangValidator

CompareValidator

CustomValidator

ValidationSummary