Drupal 7 Wildcard menu like txt-txt-% is not locating
Wildcard menu items for root level is not supported. 
Partial match wildcards are not supported either.

You can, however, remap incoming requests to a proper menu router that Drupal supports by implementing hook_url_inbound_alter. Unless there is a strict requirement to use the path pattern you mention, I wouldn't go for this solution because this hook is executed to every request, including normal pages and Ajax requests.