I don't worry about fixing 100% of something. I will find those when I proof my work.
I worry about BREAKING
anything.
Some of my saved searches are really
templates. The replace is fixed, but I tweak the search. Eg. I have a Baen-deDiv search (removes all those pesky
divs that get nested 1 MORE for each chapter-file. I tune the class cor the current book I repeat (all) n times (usually the number of chapters) until the count is 0