interview

Home / DeveloperSection / Interviews / what is email validation's regular expression in asp.net

Ask Question
Andrew Deniel

Andrew Deniel

Follow

Can you answer this question?

Answer

2 Answers

Durgesh Tripathi

Durgesh Tripathi

20-Jul-2013

The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern.
It's used for email validate,numbervalidate, url validtate, special symbol validate, etc.

Syntax for Regular Expression Validator

<asp:TextBox ID="txtEmailID" runat="server"></asp:TextBox>
 <asp:RegularExpressionValidator ID="revEmailID" runat="server"
 ControlToValidate="txtEmailID"
 ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">*</asp:RegularExpressionValidator>

Andrew Deniel

Andrew Deniel

08-Jun-2013
By using below reg expression we can validate email id

^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$

"^[_a-z0-9-]+": start with any underscore or alphanumeric one or more then one alfanumaric word
"(\.[_a-z0-9-]+)*@":any dot(.) or alphanumeric zero times or more the zero and a @ sign
"[a-z0-9-]+":one or more alphanumeric 
"(\.[a-z0-9-]+)*": zero or more dot alphanumeric or -(mins sign)
"(\.[a-z]{2,5})$": End with two to 5 character may use dot (.) in that

Liked By