regular expression validator for emal id required

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I want to know which the best code for regular expression validation for validation of an email id. The code I use is accepting more than 3 characters at the end.(kumar@gold.com123. I want the last 123 should not be allowed. My code that I use in regular expression validator for emailid is:

XML

<asp:RegularExpressionValidator ID="RegularExpressionValidator3" runat="server"
            ControlToValidate="TextBox21" ErrorMessage="Enter Valid Email ID "
            style="z-index: 1;width:250px; left: 367px; top: 216px; position: absolute;font-size: x-small;"
            ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>

Please advice.

Posted 10-Feb-13 21:53pm

S.Rajendran from Coimbatore

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5 solutions

Solution 1

A simple google search came up with this[^] link.

Posted 10-Feb-13 21:59pm

N a v a n e e t h

Solution 2

hi,

try this,

HTML

ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.(\w+([-.]\w+)*){2,3}"

this will allow, min 2 and max 3 characters after " . "

hope it helps

Posted 10-Feb-13 22:00pm

Karthik Harve

Updated 10-Feb-13 22:07pm

v2

Comments

Thomas Daniels 11-Feb-13 4:02am

For me, your expression returns "true" if I've more than 3 chars after "."

Karthik Harve 11-Feb-13 4:07am

can you try with updated answer ?

Thomas Daniels 11-Feb-13 4:11am

The expression returns still true if I've more than 3 chars after "."

Solution 3

There's one presented and discussed here[^]:

^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$

Maybe that's what you're looking for.

Posted 10-Feb-13 22:04pm

lukeer

Solution 5

Only allowing max 3 characters at the end is not advised since there are addresses now with more 3 characters as the top level domain, e.g. .travel.

Please also keep in mind that the validation is always only a formal one, i.e., you never know from just looking at it if the address really exists.

So, for your example, I would leave that check you ask for away - that's the "best" approach in the sense "not being too strict".

Cheers
Andi

Posted 10-Feb-13 22:34pm

Andreas Gieriet

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Thomas Daniels · Accepted Answer · 2013-02-10T22:18:00

Solution 4

Hi,

This regex works fine for me:

^[^.][a-zA-Z0-9_.-]*[^.]@[^.][a-zA-Z0-9_-]*[^.]\.[a-zA-Z0-9_-]{2,3}$

Posted 10-Feb-13 22:18pm

Thomas Daniels