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RegularExpressionValidator Control in ASP.Net


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RegularExpressionValidator Control in ASP.Net

Using RegularExpressionValidator server control, you can check a user's input based on a pattern that you define using a regular expression. This means that you can define a structure that a user's input will be applied against to see if its structure matches the one that you define.

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="RegularExpressionValidator">

</asp:RegularExpressionValidator>

The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern.

The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required.

Properties:

ControlToValidate

The id of the control to validate

Error Message

The text to display in the page when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set

Validation Expression

Specifies the expression used to validate input control.

Code:

<asp:Label ID="Label1" runat="server" Text="email id"></asp:Label>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="enter a valid email id" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">

</asp:RegularExpressionValidator>

 

<asp:Button ID="Button1" runat="server" Text="Submit" />

 

 

When we enter invalid email id then error message will show

RegularExpressionValidator Control in ASP.Net

 

When we enter valid email id then page will execute

RegularExpressionValidator Control in ASP.Net


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