[chaley]

Originally Posted by tekwrite

Too BAD the docs dont seem to tell you that!! All of their examples are of non custom field searhces so how are we supposed to know about the "#" sign?

See The Search Interface, and in particular:

Available fields for searching are: tag, title, author, publisher, series, series_index, rating, cover, comments, format, identifiers, date, pubdate, search, size and custom columns. If a device is plugged in, the ondevice field becomes available, when searching the calibre library view. To find the search name (actually called the lookup name) for a custom column, hover your mouse over the column header in the library view.

and

For example, to search the indices for a custom series column named #my_series, you would use the search name #my_series_index.

EDIT: Oh nos, ninjaed twice!