I would like to write a plug-in which fetches all the pages addresses/titles (or other identifiers) and redirects the user based on some input string probably a tag in the URL. Does making this sort of plug-in sound feasible? Alternatively, does this plug-in already exist?
I imagine an external script sends the user to "myconfluencewiki.com/redirectme#funnycats". From here the script looks through the wiki and finds "myconfluencewiki.com/fun/funnycats" and sends the user there instead. It does this by finding the title so that it works even if the page was originally on "myconfluencewiki.com/animals/funnycats".
There are some add-ons for redirections: Redirection, Advanced Redirection or HomePage Redirect.
If you still needs to develop your own add-on, the "path converter" module can be handy.
Regards, Gorka