Quote:
Originally Posted by theducks
have you seen a book written ISBN 10 or ISBN 13 ?
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The blank or dash
before the number isn't relevant. The regexp will (should) start matching at the first digit.
Quote:
Originally Posted by theducks
ISBN and ISBN13 are more normal (ISBN 10 is redundant. ISBN is 10 chars)
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You are right in saying it is redundant. That doesn't mean it won't be used by publishers.