Grepping notes and text boxes as well
It would be very interesting to be able to include in the search, using some flag, sticky notes and other textbox comments. I and I guess other people use PDF annotations heavily to comment papers, etc.
This is similar to #12, but I have decided to make a separate one for two reasons: 1/ I am not sure if these annotations are technically "metadata" in the same way keywords are, and 2/ I think the issues mentioned by @hpdeifel apply a bit less to this case. Notes and text boxes still can be tricky to place in the document layout, but they have anchor points (I am not sure if this is the correct terminology), which provides them with a page number, and they are potentially "full texts", some people write quite large text as notes, so it is in general not just isolated words and regexes can be very useful.
PD: Please just merge with #12 if you think the distinction does not make sense. Also, I don't find how to mark this as "enhancement".
Best, Jacobo Rouces.