what is email validation's regular expression in asp.net

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Durgesh Tripathi · Answer

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 
andlt;asp:TextBox ID="txtEmailID" runat="server"andgt;andlt;/asp:TextBoxandgt; 
and andlt;asp:RegularExpressionValidator ID="revEmailID" runat="server" 
and ControlToValidate="txtEmailID" 
and ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"andgt;*andlt;/asp:RegularExpressionValidatorandgt;

Andrew Deniel · Answer

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

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what is email validation's regular expression in asp.net

Andrew Deniel

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