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Apologies for resurrecting this post, but I have the exact same problem. For simplicity's sake I've renamed all of my ebooks with only the ISBN as the filename, e.g. 1234567890.pdf.
The expression I've tried to use (amongst numerous permutations) is (?P<isbn>.+) which works with the test field but only populates the title field when the book is actually imported. Any reason why it's not populating the ISBN field?
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