Last modified: 2005-11-03 22:48:38 UTC
An attempt to access an article with "%28" or "%29" (and probably other HTML characters) can only be done if one enters in %252528 in the URL instead of the expected %2528; for example, http://en.wikipedia.org/wiki/User:Grunt/Bug_%2528demo%2529 goes to [[en:User:Grunt/Bug (demo)]] instead of [[en:User:Grunt/Bug %28demo%29]], but http://en.wikipedia.org/wiki/User:Grunt/Bug_%252528demo%252529 goes to the proper article. Strangely, visiting http://en.wikipedia.org/w/wiki.phmtl?title=User%3AGrunt%2FBug_%2528demo%2529 goes to the proper page.
Oops; The latter URL should read http://en.wikipedia.org/w/wiki.phmtl?title=User:Grunt/Bug_%2528demo%2529.
Problem seems to be with the rewrite URLs, probably Apache is de-escaping and not re- escaping the percent sign. Raw PATH_INFO also works correctly.
Such titles are not currently legal, so not a problem. :D