correction in allow_without_dot + test

tiramisu/option.py

@@ -991,16 +991,20 @@ class DomainnameOption(Option):
         self._allow_without_dot = allow_without_dot
         end = ''
         extrachar = ''
+        extrachar_mandatory = ''
         if self._type == 'netbios':
             length = 14
         elif self._type == 'hostname':
             length = 62
         elif self._type == 'domainname':
             length = 62
-            extrachar = '\.'
+            if allow_without_dot is False:
+                extrachar_mandatory = '\.'
+            else:
+                extrachar = '\.'
             end = '+[a-z]*'
-        self._domain_re = re.compile(r'^(?:[a-z][a-z\d\-]{{,{0}}}{1}){2}$'
-                                     ''.format(length, extrachar, end))
+        self._domain_re = re.compile(r'^(?:[a-z][a-z\d\-{0}]{{,{1}}}{2}){3}$'
+                                     ''.format(extrachar, length, extrachar_mandatory, end))
         super(DomainnameOption, self).__init__(name, doc, default=default,
                                                default_multi=default_multi,
                                                callback=callback,