AWB Find+Replace rules can refer to the current page name using pseudo-variables such as %%pagename%%. This doesn't work in the Regex Tester, even though the current page text is copied in to the "Text to search" box.
Discussion at
https://en.wikipedia.org/wiki/Wikipedia_talk:AutoWikiBrowser#.25.25pagename.25.25_not_working_in_the_.27Replace_with.27_field