[Web] Fixed DKIM regex to allow arguments after the public key (#3462)

Co-authored-by: Marcel Knorr <marcel.knorr@mk-soft.net>

data/web/inc/ajax/dns_diagnostics.php

@@ -376,8 +376,8 @@ foreach ($records as $record) {
     elseif ($current['type'] == 'TXT' &&
       stripos($current['txt'], 'v=dkim') === 0 &&
       stripos($record[2], 'v=dkim') === 0) {
-        preg_match('/v=DKIM1;.*k=rsa;.*p=(.*)/i', $current[$data_field[$current['type']]], $dkim_matches_current);
-        preg_match('/v=DKIM1;.*k=rsa;.*p=(.*)/i', $record[2], $dkim_matches_good);
+        preg_match('/v=DKIM1;.*k=rsa;.*p=([^;]*).*/i', $current[$data_field[$current['type']]], $dkim_matches_current);
+        preg_match('/v=DKIM1;.*k=rsa;.*p=([^;]*).*/i', $record[2], $dkim_matches_good);
         if ($dkim_matches_current[1] == $dkim_matches_good[1]) {
           $state = state_good;
         }