I'm wondering if it's possible to apply a customised highlighting scheme to linux terminal output, outside of the application that's generating the output. (Therefore, piping the output to some kind of colouriser would not do, because it wouldn't work for interactive output.) Ideally, you could apply some kind of regexp to each line, and a colour would be applied to each line that matches. (assuming the facility is switched on)
So, does anyone know of a terminal that offers this feature? The absolute best possibility would be something screen-like, that sits between the terminal and the shell, and processes the output without getting in anything's way.