Redirect all your permalink structures! Check this out: http://yoast.com/change-wordpress-permalink-structure/. On the bottom is a generator that will show you what reg ex you need for the redirect. Then in the redirection plugin, just add the regex code to Source URL, click the regular expressions checkbox, and add the target ($4 or whatever the site says) to target. You’re done!
So my site broke for a little bit because I installed the Hikari Category Permalink plugin. I’m not to sure what happened but I ended up redoing my .htaccess, permalink structures, and reinstalling the plugin.
Needless to say it works perfect now, BUT in the process I figured out how to actually get my old category slugs to redirect to my new ones, 301 style! =D
So here’s how…
Step One in Category Redirection for WordPress
This step is easy so follow closely:
Download the redirect plugin called Redirection.
Step Two in Category Redirection for WordPress
After you installed the plugin you need to set up the redirect using some Reg Ex.
Click on Tools, then Redirection.
Once you click that you’ll see a nice simple screen that says “Add New Redirection”.
Step 3 for Category Redirection for WordPress
Now input the following:
Source URL: /your-category-name/*
Match: URL Only
Action: Redirect to URL
Regular Expression: Checked
Target URL: /your-new-category-that-you-changed/*
Save it and make sure that it’s a 301 redirect. You’ll see 301 once you view it.
Now all of your old category links will be permanently redirected to your new category links! Great for Search Engines! Enjoy!