RegularExpressionValidator - Validate email address
RegularExpressionValidator control determine whether an input control's entered value matches
a pattern defined by a regular expression. this validation control is very useful to check
predictable sequences of characters. regularexpressionvalidator is mostly use for validate
email address, social security number, telephone number, postal (zip) code etc. you also need to
add a requiredfieldvalidator control because regularexpressionvalidator cannot validate empty value
control. visual studio and visual web developer .net IDE can auto generate regularexpressionvalidator
validation expression. it is a very useful and time saving feature of visual studio. when validation failed
regularexpressionvalidator control show a predefined error message.
this example demonstrate how can we validate user inputted email address by regularexpressionvalidator. when user input email address and press the submit button, the regularexpressionvalidator control's validation expression check that the inputted email is a well formed email address or not. if it is not a valid formatted email address then validation failed and stop form submission.
this example demonstrate how can we validate user inputted email address by regularexpressionvalidator. when user input email address and press the submit button, the regularexpressionvalidator control's validation expression check that the inputted email is a well formed email address or not. if it is not a valid formatted email address then validation failed and stop form submission.
EmailValidation.aspx
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Your email: " + TextBox1.Text.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>asp.net RegularExpressionValidator example: how to validate email address</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Red">RegularExpressionValidator: email</h2>
<asp:Label
ID="Label1"
runat="server"
Font-Bold="true"
Font-Italic="true"
Font-Size="Large"
ForeColor="SeaGreen"
>
</asp:Label>
<br /><br />
<asp:Label
ID="Label2"
runat="server"
Text="Email"
>
</asp:Label>
<asp:TextBox
ID="TextBox1"
runat="server"
BackColor="DodgerBlue"
ForeColor="AliceBlue"
>
</asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1"
runat="server"
ControlToValidate="TextBox1"
Text="*"
>
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator
ID="RegularExpressionValidator1"
runat="server"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
ControlToValidate="TextBox1"
ErrorMessage="Input valid email address!"
>
</asp:RegularExpressionValidator>
<br /><br />
<asp:Button
ID="Button1"
runat="server"
Text="Submit email"
Font-Bold="true"
ForeColor="DodgerBlue"
OnClick="Button1_Click"
/>
</div>
</form>
</body>
</html>



- RangeValidator to validate date range
- RangeValidator to validate data type integer
- RegularExpressionValidator to validate URL
- RegularExpressionValidator to validate U.S. Zip Code
- RegularExpressionValidator to validate U.S. Phone Number
- RegularExpressionValidator to validate U.S. Social Security Number
- RequiredFieldValidator to validate RadioButtonList