From: Phlip <phlip2005@...>
Date: 2008-07-28T23:19:41+09:00
Subject: Re: regarding validation of email address.

Vamsi Krishna wrote:

> ex: user+tag@gmail.com
> 
>  so in order to validate this where should i put + symbol in regular
> expression so that i send emails to user+tag@gmail.com.

E-mail address validation is a FAQ in the Regular Expression discipline.

You can't do it. No Regexp can successfully distinguish valid from invalid 
e-mail addresses, in all their permutations.

If you want to provide a simple defense against typographical errors, such as 
omitting the @, you must write a Regexp that is too wide, and will permit some 
ill-formed addresses to slip past.

-- 
   Phlip