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255)
{
return false;
}
/*
* Check the local address
* We're a bit more conservative about what constitutes a "legal" address, that is, A-Za-z0-9!#$%&\'*+/=?^_`{|}~-
* Also, the last character in local cannot be a period ('.')
*/
$allowed = 'A-Za-z0-9!#&*+=?_-';
$regex = "/^[$allowed][\.$allowed]{0,63}$/";
if (!preg_match($regex, $local) || substr($local, -1) == '.')
{
return false;
}
// No problem if the domain looks like an IP address, ish
$regex = '/^[0-9\.]+$/';
if (preg_match($regex, $domain))
{
return true;
}
// Check Lengths
$localLen = strlen($local);
if ($localLen < 1 || $localLen > 64)
{
return false;
}
// Check the domain
$domain_array = explode(".", rtrim($domain, '.'));
$regex = '/^[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/';
foreach ($domain_array as $domain)
{
// Convert domain to punycode
$domain = JStringPunycode::toPunycode($domain);
// Must be something
if (!$domain)
{
return false;
}
// Check for invalid characters
if (!preg_match($regex, $domain))
{
return false;
}
// Check for a dash at the beginning of the domain
if (strpos($domain, '-') === 0)
{
return false;
}
// Check for a dash at the end of the domain
$length = strlen($domain) - 1;
if (strpos($domain, '-', $length) === $length)
{
return false;
}
}
return true;
}
}