[jwes]

1. Open the epub
2. Select the first two lines that begin with <tr>
3. Mark selected text.
4. Regex search for f\d\d
Replace all works iff wrap is on or the cursor is before the marked text. This is inconvenient as the cursor is generally at the end of the marked text from selecting.

Filter Replacements Table and Dry Run Replace All Table, appear to ignore Marked Text and work on the prior search scope.

This is the search I was using.
[search_entries]
1\Name=Unnamed Search
1\Find=f\\d\\d
1\Replace=
1\Controls=RX DN AH
size=1