/**
Validate an email address.
Provide email address (raw input)
Returns true if the email address has the email
address format and the domain exists.
Not following the usual coding style I know but I can't bring
myself to touch it... You'd better not touch it either, Rob: That means
you.
Author: Humblehope
Modified: 06/06/2007
**/
function validEmail($email)
{
$isValid = true;
$atIndex = strrpos($email, "@");
if (is_bool($atIndex) && !$atIndex)
{
$isValid = false;
}
else
{
$domain = substr($email, $atIndex+1);
$local = substr($email, 0, $atIndex);
$localLen = strlen($local);
$domainLen = strlen($domain);
if ($localLen < 1 || $localLen > 64)
{
// local part length exceeded
$isValid = false;
}
else if ($domainLen < 1 || $domainLen > 255)
{
// domain part length exceeded
$isValid = false;
}
else if ($local[0] == '.' || $local[$localLen-1]
== '.')
{
// local part starts or ends with '.'
$isValid = false;
}
else if (preg_match('/\\.\\./', $local))
{
// local part has two consecutive dots
$isValid = false;
}
else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/',
$domain))
{
// character not valid in domain part
$isValid = false;
}
else if (preg_match('/\\.\\./', $domain))
{
// domain part has two consecutive dots
$isValid = false;
}
else if
(!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',
str_replace("\\\\","",$local)))
{
// character not valid in local part
unless
// local part is quoted
if (!preg_match('/^"(\\\\"|[^"])+"$/',
str_replace("\\\\","",$local)))
{
$isValid = false;
}
}
if ($isValid && !(checkdnsrr($domain,"MX") ||
checkdnsrr($domain,"A")))
{
// domain not found in DNS
$isValid = false;
}
}
return $isValid;
}
On Sun, 7 Dec 2008, Nathan Rixham wrote:
Ashley Sheridan wrote:
On Sun, 2008-12-07 at 02:27 -0800, Yeti wrote:
I put a small one together using regular expressions,
http://www.ashleysheridan.co.uk/coding_php_validation.php
So we are "regexing" emails again?
#OUT OF coding_php_validation.php COPY
case 'email':
{
$expression = "/^([a-z0-9_\-\.]+)@([a-z0-9_\-\.]+)\.([a-z]{2,5})$/i";
$errorText = "The email does not appear to be a valid type.";
break;
}
#END COPY
What should be valid email addresses according to RFC 2822 [1]:
!#$%&*+-/=?^_`{|[EMAIL PROTECTED]
"@"@example.com
Not valid email addresses:
"\"@example.com
@@example.com
- [EMAIL PROTECTED]
Valid email addresses according to the Multipurpose Internet Mail
Extension (MIME) [2]:
[EMAIL PROTECTED]
Ã(c)@℞.com
Yes, I know I'm going to hell, but it serves well for most purposes. In
the future when I actually see people use those kind of email addresses
then I'll update it.
Ash
www.ashleysheridan.co.uk
basically if it has 1 or more printable chars followed by an @ followed by 1
- 63 printable chars followed by a period followed by a valid domain
extension it's good; that's simple regex :p
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