Merge branch '4522-fix-regex' into 'master'

Resolve "Remote DNS: Getting zone id of subdomain prohibited by regex"

Closes #4522

See merge request ispconfig/ispconfig3!774

Author: Till Brehm

interface/lib/classes/remote.d/dns.inc.php

@@ -240,7 +240,7 @@ public function dns_zone_get_id($session_id, $origin)
 			return false;
 		}
 
-		if(!preg_match('/^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z]{2,4})+$/i', $origin)){
+		if(!preg_match('/^([a-z0-9][a-z0-9\-]+[a-z0-9]|[a-z0-9]{2})(\.[a-z]{2,63})+$/i', $origin)){
 			throw new SoapFault('no_domain_found', 'Invalid domain name.');
 			return false;
 		}