I found this excellent implementation of the PCRE library wrapped for Delphi by Jan Goyvaerts. The Delphi code is MPL 1.1, and the PCRE engine is BSD, so it's all usable in any of our projects, and it's perfect for Transformer because it handles UTF8. I initially compiled and installed the component, which is designed to work with the dll that's shipped with it, but every time I destroyed a created instance of the component, I was getting access violations, so I edited the source to link to the C object files instead of linking to the dll. This uses a slightly newer version of PCRE, and more important, it doesn't generate the AVs. Built a test app, wrapping the component in my own class to suit what Transformer will want to do. Everything works fine!

So yet another mighty step forward: now I can provide good Unicode regular expression support, without having to map it to the JavaScript library.