ASP.NET Tutorial/Validation/RegularExpressionValidator

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Making sure the text-box value is an e-mail address

<%@ Page Language="VB" %>
<script runat="server">
    Protected Sub Button1_Click(sender As Object, e As EventArgs)
       Label1.Text = "Passwords match"
    End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>CompareFieldValidator</title>
</head>
<body>
    <form id="Form1" runat="server">
        Email:
        <asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1"
                                        Runat="server" 
                                        ControlToValidate="TextBox1"
                                        ErrorMessage="You must enter an email address"
                                        ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">
        </asp:RegularExpressionValidator>
        
            <asp:Button ID="Button1" OnClick="Button1_Click" 
             Runat="server" Text="Login"></asp:Button>
        
        
            <asp:Label ID="Label1" Runat="server"></asp:Label>
        
    </form>
</body>
</html>


Validate email

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Regular Expression Tester</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        Email:<br />
        <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
           <asp:RegularExpressionValidator ID="regEmail" 
           runat="server" 
           ControlToValidate="txtEmail"  
           ValidationExpression="^(.+)@([^\.].*)\.([a-z]{2,})$"
           Text="Enter a valid email" />   
        
         
      <asp:Button ID="btnSubmit" 
                  Text="Click this to test validation" 
                  runat="server" />
      
    </div>
    </form>
</body>
</html>


Validate Name

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Regular Expression Tester</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    Name:<br />
    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
    <asp:RegularExpressionValidator ID="regName" runat="server" 
       ControlToValidate="txtName" 
       ValidationExpression="^[a-zA-Z".\s]{1,50}"
       Text="Enter a valid name" />   
    
      
      <asp:Button ID="btnSubmit" Text="Click this to test validation" runat="server" />
      
    </div>
    </form>
</body>
</html>


Validate phone number

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Regular Expression Tester</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        Phone Number:<br />
        <asp:TextBox ID="txtPhone" runat="server"></asp:TextBox>
           <asp:RegularExpressionValidator 
           ID="regPhone" 
           runat="server" 
           ControlToValidate="txtPhone" 
           ValidationExpression="^(\(?\s*\d{3}\s*[\)\-\.]?\s*)?[2-9]\d{2}\s*[\-\.]\s*\d{4}$"
           Text="Enter a valid phone number" />   
        
         
      <asp:Button ID="btnSubmit" 
                  Text="Click this to test validation" 
                  runat="server" />
      
    </div>
    </form>
</body>
</html>


Validate URL

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Regular Expression Tester</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        Web Site URL:<br />
        <asp:TextBox ID="txtUrl" runat="server"></asp:TextBox>
           <asp:RegularExpressionValidator ID="regUrl" 
           runat="server" 
           ControlToValidate="txtUrl" 
           ValidationExpression="^((http|https)://)?([\w-]+\.)+[\w]+(/[\w- ./?]*)?$"
           Text="Enter a valid URL" />   
        
         
      <asp:Button ID="btnSubmit" Text="Click this to test validation" runat="server" />
      
    </div>
    </form>
</body>
</html>


Validate Zip code

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Regular Expression Tester</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="Label3" 
                   runat="server" 
                   Text="The Following Field (TextBox3) Must be a US Zip Code."></asp:Label><br />
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" 
                                        runat="server" 
                                        ControlToValidate="TextBox3"
                                        ErrorMessage="TextBox3 Must be a US Zip Code" 
                                        SetFocusOnError="True" 
                                        ValidationExpression="\d{5}(-\d{4})?">*</asp:RegularExpressionValidator><br />
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Validation/RegularExpressionValidator&oldid=3045»