Revert r22441 (#39553).

git-svn-id: https://svn.redmine.org/redmine/branches/5.0-stable@22444 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/acts/mentionable.rb

@@ -103,9 +103,7 @@ module Redmine
             \s|
             \]|
             <|
-            [[:punct:]]?
-            $
-          )
+            $)
         /ix
       end
     end