Regex Capture Replacement (Case Conversion etc)

While working with regex, I was trying to change the capitalization of the capture-results. But could not find a variation of the syntax that supported this.

DOpus: regex reference.

General: regex reference - on this specific topic.

FYI: I was actually doing this within the Rename tool, but that is not particularly important.

I don't think Microsoft's C++ regular expressions support case conversion, or if they do I can't find the syntax.

As far as I can tell, the same is true of the JScript regex support.

Using a bit of script code instead of regex for this is what I'd do.