Fix nameserver regex again to make sure all nameserver-like hostnames match

pythonwhois/__init__.py

@@ -41,7 +41,7 @@ grammar = {
 					 'Record maintained by:\s?(?P<val>.+)',
 					 'Registration Service Provided By:\s?(?P<val>.+)'],
 		'whois_server':		['Registrar Whois:\s?(?P<val>.+)'],
-		'name_servers':		['(?P<val>[a-z]+d?ns[0-9]+\.([a-z0-9-]+\.)+[a-z0-9]+)',
+		'name_servers':		['(?P<val>[a-z]*d?ns[0-9]+\.([a-z0-9-]+\.)+[a-z0-9]+)',
 					 '(?P<val>[a-z0-9-]+\.d?ns[0-9]*\.([a-z0-9-]+\.)+[a-z0-9]+)',
 					 '(?P<val>([a-z0-9-]+\.)+[a-z0-9]+)(\s+([0-9]{1,3}\.){3}[0-9]{1,3})'],
 		'emails':		['(?P<val>[\w.-]+@[\w.-]+\.[\w]{2,4})']