I went to replicate the problem for a bug report, and had a thought along the way. Instead of just using space characters in the search string, I tried \s+, and it worked beautifully.
Code:
title\s+/\s+\d+
\d+\s+/\s+author
is what was needed.
I noticed in the book text that there were a LOT of extra spaces coming across, sometimes inside words, sometimes between words. So I guess that is in the pdf text layer.