%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E5%AE%9A%E7%BE%A9%E6%9B%B8%3Atag_name_rules.md

@@ -20,4 +20,8 @@ TagNameRule の after_update に TagName に対する置換処理を入れる．
 
 | priority | source_pattern | replacement | created_at | updated_at | discarded_at |
 | :------: | :------------: | :---------: | :--------: | :----------: | :-----------: |
-| 10 | `\*` | `_` | Time.current | Time.current | NULL |
+| 10 | `\*` | `_` | Time.current | Time.current | NULL |
+| 20 | `\?` | `_` | Time.current | Time.current | NULL |
+| 30 | `_+` | `_` | Time.current | Time.current | NULL |
+| 40 | `^_|_$` |  | Time.current | Time.current | NULL |
+| 50 | `^$` | `null` | Time.current | Time.current | NULL |