How to Allow Three Dots in a Textbox For Email Validation in Windows Application?

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I had Allowed Validation for two Dots coding is...

string pattern =   string pattern = @"^[a-z][a-z|0-9_\-\|]*([_][a-z|0-9]+)*([.][a-z|" +
                    @"0-9]+([_][a-z|0-9]+)*)?@[a-z][a-z|0-9|]*\.([a-z]" +
                    @"[a-z|0-9]*(\.[a-z][a-z|0-9]*)?)$";

But i have to allow 3 dots only,
~~please Help me sir!~~

Posted 29-Jan-12 21:25pm

sunil from madras

Updated 30-Jan-12 22:17pm

Rajesh Anuhya

v3

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OriginalGriff 30-Jan-12 3:31am

I'm not too shabby at regexes, and I have to agree with Expresso that that won't work: "[.]" is an invalid character class.
What are you actually trying to achieve, that you think this regex is the way to go?

Sergey Alexandrovich Kryukov 30-Jan-12 3:35am

Agree. Maybe changing from [.] to [\.] will fix it?
--SA

OriginalGriff 30-Jan-12 3:36am

I did think of that, but I'm not so sure what his problem actually is, so it's difficult to say.

[no name] 30-Jan-12 8:02am

I *guess* this is what he's trying to convey: The regex is currently allowing only 2 dots in the email ID. And he needs to change it to allow 3 dots. :)

Although, the regex looks quite shabby and I'm clueless where to correct! :)

BillWoodruff 30-Jan-12 22:12pm

I wonder why you are using three dots here, since, in Windows programming user interfaces, that has been used for a long time in certain ways. Although, technically what is being referred to here :

http://en.wikipedia.org/wiki/Ellipsis#Computer_interfaces_and_programming

Is the ellipsis character, not three dots.

Arun Varghese 31-Jan-12 0:07am

NO idea Sir ji...

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Menon Santosh · Answer 1 · 2012-01-30T22:16:00

C#

public static bool ValidateEmail(string StreMail)
        {
            if (StreMail.Length == 0) return true;
            System.Text.RegularExpressions.Regex rEmail = new System.Text.RegularExpressions.Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
            if (rEmail.IsMatch(StreMail)) return true;
            return false;
        }