Relaunched a website form an architecture where WordPress only supported the blog, to a new structure where wordpress supports the full site.
Trying to redirect old blog archives to new archives that comprise three categories - here is an example:
Desired Redirect -
Source URL: sitename.com/blog/2012/09
Target URL: sitename.com/2012/09/?cat=306,10,11
Have tried various fixes with no success = Obviously I am doing something wrong with the Regex code as the special characters are being translated to create to an incorrect URL like:
Can someone please let me know how to define the Target URL to maintain the integrity of the category filter in the query string?