Prevent unwanted textile link parsing at end of line.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1557 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redcloth.rb

@@ -786,7 +786,7 @@ class RedCloth < String
             \s?
             (?:\(([^)]+?)\)(?="))?     # $title
             ":
-            (\S+?)                     # $url
+            ([\w\/]\S+?)               # $url
             (\/)?                      # $slash
             ([^\w\/;]*?)               # $post
             (?=<|\s|$)