Thread:Project:Support desk/Slash in page's title/reply (2)

And if "OS" does exist? On the English Wikipedia this is the case - both "OS" and "OS/2" exist, which causes problems.

Anyway, about using "%" as a replacement for "/" won't always work. Here are some examples:
 * Percy_Jackson_%26_the_Olympians (%26 means "&")
 * Google%2B (%2B means "+")

It can work with "%" if you replace the 400 error page with a new one, which will be a PHP script. It's not a good solution for a CMS system.

Still, %2F can be in use.