This kind of thing wasn't especially necessary until the advent of autotagging, but if you were going to put it in, it might as well go into the generic search capability.

I have an AutoTag that searches for email/files referencing the tag 'MaRs' (a project). Trouble is, I realized it is matching the likes of "Robert Marshall".

Would be good if, among the other regex capabilities, one could give an "entire word" specifier to prevent this miscategorizaion.