[SMARTY] SmartyValidate-2.6: validate_criteria.isEmail.php and RFC 2821

Hi there,

I've been working on a form, which needs to validate if the input is a valid
e-mail address and stumbled over this:

When I enter an e-mail adress that contains umlauts, (e.g. äöüß don't know if
you can read this...) the address is considered to be a valid e-mail address.

However, I remembered that umlauts are not allowed and looked up RFC 2821,
saying this:

    Systems MUST NOT define mailboxes in such a way as to require the use
    in SMTP of non-ASCII characters (octets with the high order bit set
    to one) or ASCII "control characters" (decimal value 0-31 and 127).
    These characters MUST NOT be used in MAIL or RCPT commands or other
    commands that require mailbox names.
    -- (http://ftp.rfc-editor.org/in-notes/rfc2821.txt, 4.1.2 Command Argument
       Syntax, Page 36)

Looking at validate_criteria.isEmail.php I am under the impression - I am not
the regexp-guru - that function smarty_validate_criteria_isEmail checks for
conforming domain-parts, but not local-parts of e-mail adresses, right?

Here's the function so you don't need to look it up:

function smarty_validate_criteria_isEmail($value, $empty, &$params, &$formvars) {

    if(strlen($value) == 0)
        return $empty;

    // in case value is several addresses separated by newlines
    $_addresses = preg_split('![\n\r]+!', $value);

    foreach($_addresses as $_address) {
    $_is_valid = !(preg_match('!@.*@|\.\.|\,|\;!', $_address) ||
          !preg_match('!^.+\@(\[?)[a-zA-Z0-9\.\-]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$!', $_address));

        if(!$_is_valid)
            return false;
    }
    return true;
}


TIA,

p@rick

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