Re: [PHP] Checking for a Valid Email String.

[chris]

On Wed, 12 Mar 2003 14:42:04 +1300, Philip J. Newman 
<[EMAIL PROTECTED]> wrote:

how ever i don't think most ISPs let users pick names with the + sign in 
it

----- Original Message -----
From: "Paul Chvostek" <[EMAIL PROTECTED]>
To: "David E.S.V." <[EMAIL PROTECTED]>
Cc: "Philip J. Newman" <[EMAIL PROTECTED]>; <php- 
[EMAIL PROTECTED]>
Sent: Wednesday, March 12, 2003 2:37 PM
Subject: Re: [PHP] Checking for a Valid Email String.


> On Wed, 12 Mar 2003, Philip J. Newman wrote:
>
> > Required: Help for checking for a valid email string.
On Tue, Mar 11, 2003 at 08:19:36PM -0500, David E.S.V. wrote:
>
> you mean something like this?
>
> //checking if the email is valid
>
> if
(eregi("^[0-9a-z]([-_.]?[0-9a-z])[EMAIL PROTECTED]([-.]?[0-9a-z])*\\.[a- 
z]{2,3}$",
$email, $check))
>  {
>   if ( !getmxrr(substr(strstr($check[0], '@'), 1),
$validate_email_temp) )
>     $mensaje="server not valid";
>
>   // checking DNS
>   if(!checkdnsrr(substr(strstr($check[0], '@'), 1),"ANY"))
>      $mensaje="server not valid";
>
>  }
Don't forget plus signs.  When providing email addresses to lists and
web sites, I regularly tag my address (as the From address on this
message demonstrates).  Using procmail for local delivery allows these
addresses to be delivered to my account, and I can more easily track
down the origin of "tagged" spam.  When I come across a web site or list
that doesn't allow my address with a plus sign, I find another site or
list.  So I use:
function isvalidemail($what) {
if
(!eregi('[a-z0-9][a-z0-9._=+-]*@([a-z0-9][a-z0-9-]*\.)+[a-z][a- 
z]+$',$what))
return(false);
list($user,$domain) = explode("@",$what);
if (!getmxrr($domain,$mxhosts)) return(false);
if (!count($mxhosts) > 0) return(false);
return(true);
}
--
Paul Chvostek                                             <[EMAIL PROTECTED]>
Operations / Abuse / Whatever
it.canada, hosting and development                   http://www.it.ca/

What about those of us who run our own mailservers?  A plus sign is a valid 
character in an email address.  Doesn't matter if places like AOL don't let 
their users put it in their user's email addresses.  There's no point in 
*not* allowing it, since it *is* a valid character.

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