I just learned the (very) hard way that Lyx, unlike standard word processors and other text-manipulating software that I've used, does not limit the effect of "replace all" to selected text (when something has been selected).
Am I unaware of some switch that can change this behavior, perhaps — or is there really no way to to select some text and "replace all" limited to what's been selected? It's a feature I use constantly in other applications that's become second-nature ... -David