Hello, I committed a first version of the manual for the Advanced Find and Replace.
http://www.lyx.org/trac/log/lyx-devel/trunk/lib/doc/AdvancedSearch.lyx?rev=32793
AFAICR, somebody wanted to integrate it into the UserGuide.lyx (instead of keeping it as a separate document), so I would say this is a good moment for doing that.
T.
