Wednesday, May 15, 2013

RegularExpression Validator asp.net

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Validates whether the value of an associated input control matches the pattern specified by a regular expression.

Syntax :

  <asp:RegularExpressionValidator  
            ID="RegularExpressionValidator1" 
            runat="server"  
            ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" 
            ControlToValidate="txtemail" 
            ErrorMessage="Input valid email address!" 
           Display="Dynamic" > 
        </asp:RegularExpressionValidator> 


Where
              ValidationExpression =Define the validation expression(regular expression)
                 ControlToValidate= Name of control which have to validate.
                  ErrorMessage=custom  error message.






Example :    How to validate Email Address, numeric  digit  in asp.net



<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head runat="server">
    <title>RegularExpressionValidator asp.net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>
      RegularExpressionValidator asp.net-Validate Email Address
    </h1>
   
        <asp:TextBox ID="txtemail" runat="server"></asp:TextBox>
         <asp:RegularExpressionValidator  
            ID="RegularExpressionValidator1" 
            runat="server"  
            ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" 
            ControlToValidate="txtemail" 
            ErrorMessage="Input valid email address!" 
           Display="Dynamic" > 
        </asp:RegularExpressionValidator> 
       
        <asp:Button ID="Button1" runat="server" Text="Submit" />
    </div>
   
        <div>
    <h1>
      RegularExpressionValidator asp.net-Validate 10 Numeric digit
    </h1>
   
        <asp:TextBox ID="txtdigit" runat="server"></asp:TextBox>
         <asp:RegularExpressionValidator  
            ID="RegularExpressionValidator2" 
            runat="server"  
            ValidationExpression="^[0-9]{10}" 
            ControlToValidate="txtdigit" 
            ErrorMessage="Input valid number" 
           Display="Dynamic" > 
        </asp:RegularExpressionValidator> 
       
        <asp:Button ID="Button2" runat="server" Text="Submit" />
    </div>
   
   
    </form>
</body>
</html>



Download Source code : RegularExpressionValidator asp.net
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