I grabbed the following from a web-published article (sorry, can't remember
where):
function validate_email($email) {
if(preg_match("/^( [a-zA-Z0-9] )+( [a-zA-Z0-9\._-] )*@( [a-zA-Z0-9_-] )+(
\.[a-zA-Z0-9_-] +)+$/" , $email)){
list($username,$domain)=split('@',$email);
if(!customCheckDnsrr($domain)){
$valid = 0;
} else {
$valid = 1;
}
} else {
$valid = 0;
}
return $valid;
}
function customCheckDnsrr($host,$recType='') {
if(!empty($host)) {
if($recType=='') $recType="MX";
exec("nslookup -type=$recType $host",$output);
foreach($output as $line) {
if(preg_match("/^$host/", $line)) {
return true;
}
}
return false;
}
return false;
}
I think this covers a windows server (like mine), but there is a shorter one
for Linux (which I'm moving to in the near future).
Never tested this, so can't comment on usefulness.
George
> -----Original Message-----
> From: Curt Zirzow [mailto:czirzow@xxxxxxxxx]
> Sent: 16 November 2005 4:04 am
> To: php-general@xxxxxxxxxxxxx
> Subject: Re: Validating Email addrs
>
>
> On Tue, Nov 15, 2005 at 11:16:15AM -0500, Leonard Burton wrote:
> > Hi All,
> >
> > I know that it is pretty darn impossible to come up with a regular
> > expression for validating emails.
> >
> > How do you all validated emails on form submission?
> >
> > Is it good just to do something like "/.+@.+[.].+/" ? That (or a
> > close derivative) should match that there is at least a @ and a . with
> > chars before and after each. I will be sending an email to each new
> > registration with a confirmation link.
>
> Since you will be validating emails via a confirmation link, i'd
> probably suggest using the minimal testing, I dont think it is
> worth the headache. If you become to strict on your regex you
> might eliminate something that is valid but the regex thought was
> invalid.
>
> At minimum a@xxxx so to modify the regex a bit:
>
> /^.+@.+\..{2,}$/
>
> Curt
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