Add hyphens to ISBN number

This may be worth mentioning. The grep will be fine if you are working only with books from one publisher, CUP, with code 1-107. If you are doing this in general you may not know that the sections in an ISBN are of different lengths. Even those from the same publisher...

Other ISBN ranges for Cambridge University Press: Cambridge University Press (978-0-511-...) · Cambridge University Press (978-0-521-...) · Cambridge University Press (978-0-931837-...) · Cambridge University Press (978-0-949009-...) · Cambridge University Press (978-1-108-...) · Cambridge University Press (978-1-139-...) · Cambridge University Press (978-1-316-...) · Cambridge University Press (978-1-4213-...) · Cambridge University Press (978-1-55899-...) · Cambridge University Press (978-4-902290-...) · Cambridge University Press (978-84-8323-...) · Cambridge University Press (978-84-9036-...) · Cambridge University Press (978-93-82993-...)