Validating email addresses with some regular expression is over-rated. You can only check if the email address is well-formed (not if it exists), but as your .name example shows, if you are too zealous here, you get into trouble by rejecting too much.

If someone wants to not give you his real email address, he can just type mickey.mouse@microsoft.com which would be fine for your validator routine. If someone mistypes his email address by accident, the chance that your validator can catch that is very slim as well.

If you need to validate an email address, the only way to do that is to send an email to that address and wait for a reply. So for form validations, it does not make sense to check more than that the string contains an @ and at least one dot after that. 

if ( /\@.+\./ ) { 
   # email looks good 
}

[download]

In reply to Re: On Validating Email Addresses by Thilosophy
in thread On Validating Email Addresses by dws

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.