I just wanted to give a shoutout for this plugin I just found, activated and which solved my problems in seconds! I was looking for something to redirect any requests for /category/ to /tag/ since WordPress decided to delete all my categories after converting them to tags the other day. I tried doing this with a redirect in cpanel and .htaccess which didn’t seem to work (I don’t know why) and I discovered I should have been doing this with mod_rewrite already, but again it didn’t seem to work.
In any event, this plugin seems to solve the problem in seconds and I like the log it gives. I may actually look at moving the rest of my redirects (for old pages before wordpress) into this system so I can more easily track them as well.
The only config I had to do after dropping the plugin in and activiating it was putting the following redirection in place:
Source URL: /category/(.*)
Target URL: /tag/$1
Type: Simple redirection
(courtesty of perassi.org)