[unboggling]

penguinaka, thanks. I've saved that list for trying out the next time I add books. Which will be weeks in future because I'm in the midst of cleaning up a big batch already imported. I'm not sure what takes the least amount of time: (1) preprocessing in the OS into directories to match each import regex, or (2) importing raw downloads then postprocessing in calibre. I suspect (1) is faster. I've done it both ways and both ways are time consuming. As I become more familiar with regex and search-terms/operators in both OS and calibre the time decreases either way. (I'm specifically referring to a group of downloaded books in which there are varying levels of directories and varying filename standards.)