[GrannyGrump]

I know the regex gurus will have some wonderful black magic to do this, but the simplest way I've found is to include the space before ID. As in, when you are in the find box, hit spacebar, then type ID. If it is always in caps, type it that way, and on the drop-down list, choose "case sensitive."

Now if you have several hundred words beginning with the letters "ID", you might have to wait for some regex magic. But meanwhile, you could use the "replace/find" to go through your document one word at a time, and if you strike one that isn't the ID you want to change, just click the "find " button to jump ahead.

EDIT --- I see the Mighty Turtle beat me, I am a slow typist.... The Tortoise and the Hare?