I manually converted all books of my Calibre library which are other than epub to epub format (to have an common format which all my devices support). II did this via script and Calibre's commandline executable 'ebook-convert'.
Now I want to add the new variants to the existing book records of my Calibre library. Each converted files resides in the same folders as the source file.
Preferences for 'Adding books' are set to:
- Read metadata from file name (rather than file contents)
- Regex to extract metadata is default: (?P<title>.+) - (?P<author>[^_]+)
- Auto-merge added books if the already exist: Ignore duplicate incoming formats
But in most cases new records are created (and added books' files are copied to a new folder). I guess this is because Calibre cannot match the shortened title/author strings from file names to it's metadata records.
Any ideas?