Ciao StephanF
There IS at least one plugin, I think, that does global search and replace. I'm trying to find it.
A footnote: BTW, if you are using Firefox,
inside the TW editor you can directly invoke any external program you want by installing the
It's All Text Add-On for Firefox. That Firefox plugin saves a temporary copy of the edit area to a file, opens the application for it you assign, detects when the file changes & updates the edit area. I use it both for external SVG editing in a graphics program and for simple text editing in a full featured text editor that supports regex. But, of course, you are not going to get global regex that way, just the one tiddler.
Best wishes
Josiah