This mode is the most discriminating of The Archivist.
The research is operated on a word or an expression identical to what you typed in the Look for dialog.
For example, if you are looking for "CD-ROM” the expressions “CD ROM” and “CD/ROM” will not match.
Consequently you must type exactly the write string or use another mode. In the example, it would have been preferable to use the “Look for characters” mode.