Add one-versus-many-matches logic to network filter plugin (#30511)

* Add one-versus-many-matches logic

* Fixed indentation (tabs ==> spaces)

lib/ansible/plugins/filter/network.py

@@ -56,6 +56,9 @@ def re_matchall(regex, value):
         obj = {}
         if regex.groupindex:
             for name, index in iteritems(regex.groupindex):
+                if len(regex.groupindex) == 1:
+                    obj[name] = match
+                else:
                     obj[name] = match[index - 1]
             objects.append(obj)
     return objects