validating nickname!

[tonu155]

i made for users the "alias" (nickname) so it will be easier to communicate dor them in public. anyway tried with validations:

 

everything seems to be OK exept the validation:

 

  function tep_validate_alias($alias) {
   $valid_address = true;

   $valid_chars = "abcdefghijklmnopqrstuvxyzw";
   $atom = "$valid_chars+";
   $quoted_user='(\"[^\"]*\")';
   $word = "($atom|$quoted_user)";
   $user_pat = "^$word(\.$word)*$";
   $ip_domain_pat='^\[([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\]$';
   $domain_pat = "^$atom(\.$atom)*$";

   if (eregi($alias_pat, $alias, $components)) {
     $user = $components[1];
     $domain = $components[2];
     // validate user
     if (eregi($user_pat, $user)) {
       // validate domain
       if (eregi($ip_domain_pat, $domain, $ip_components)) {
         // this is an IP address
        for ($i=1;$i<=4;$i++) {
          if ($ip_components[$i] > 255) {
            $valid_address = false;
            break;
          }
         }
       }
       else {
         // Domain is a name, not an IP
         if (eregi($domain_pat, $domain)) {
           /* domain name seems valid, but now make sure that it ends in a valid TLD or ccTLD
              and that there's a hostname preceding the domain or country. */
           $domain_components = explode(".", $domain);
           // Make sure there's a host name preceding the domain.
           if (sizeof($domain_components) < 2) {
             $valid_address = false;
           } else {
             $top_level_domain = strtolower($domain_components[sizeof($domain_components)-1]);
             // Allow all 2-letter TLDs (ccTLDs)
             if (eregi('^[a-z][a-z]$', $top_level_domain) != 1) {
               $tld_pattern = '';
               // Get authorized TLDs from text file
               $tlds = file(DIR_WS_INCLUDES . 'tld.txt');
               while (list(,$line) = each($tlds)) {
                 // Get rid of comments
                 $words = explode('#', $line);
                 $tld = trim($words[0]);
                 // TLDs should be 3 letters or more
                 if (eregi('^[a-z]{3,}$', $tld) == 1) {
                   $tld_pattern .= '^' . $tld . '$|';
                 }
               }
               // Remove last '|'
               $tld_pattern = substr($tld_pattern, 0, -1);
               if (eregi("$tld_pattern", $top_level_domain) == 0) {
                   $valid_address = false;
               }
             }
           }
         }
         else {
          $valid_address = false;
        }
    	 }
     }
     else {
       $valid_address = false;
     }
   }
   else {
     $valid_address = false;
   }
   if ($valid_address && ENTRY_ALIAS_CHECK == 'true') {
     if (!checkdnsrr($domain, "MX") && !checkdnsrr($domain, "A")) {
       $valid_address = false;
     }
   }
   return $valid_address;
 }
?>

 

i really do hope that somebody can help me with this...this code is originally taken from validations.php

 

Maybe there is something that i need to change in phpMyAdmin....but what and how???