Redirecting OPACs in the Evergreen ILS

We currently use the Evergreen open-source ILS, and after upgrading to version 2.2, we switched to the new TPac from the old JSPac. The new OPAC is faster and has some nice features, like sending call numbers to a phone.
But there was one problem: we have a whole lot of links in our web content (mostly in libguides) to titles on the JSPac. I wanted to redirect those URLs to the same items on the TPAC, so users wouldn't be confused by the old interface. In the process, I found that some of our librarians linked to title searches rather than individual item records. (Thanks, libguides authors!) So I decided to try to redirect a few more kinds of the old OPAC URLs.
Just in case there's anyone else in the same boat, here's a generic version of the code I came up with. This is all Apache configuration info, placed in the relevant VirtualHost section of eg.conf.

It handles all the old links I could find in our web content:

• links to the main catalog page
• links to the OPAC login page
• links to individual item records, and
• links to basic search results

One could do a more thorough and/or reliable job of this. I didn't attempt to handle advanced searches, for example. On the off chance anyone uses or improves on this, please let me know!