In case your next question is how to check the number of a credit card is valid, I doubt if you can do this with regex, but I DO have some C++ code to check both ISBN and Credit cards, and most other protocols of this type. In fact I wonder if there is any interest in these as a Boost library? Paul Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539 561830 +44 7714 330204 mailto: pbristow@hetp.u-net.com | -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Jeff Garland | Sent: 09 April 2005 15:24 | To: boost@lists.boost.org | Subject: Re: [boost] Regex-User: ISBN validation | | On Mon, 4 Apr 2005 10:05:52 +0200, Detlef wrote | > Hi, | > | > we need to validate ISBN. | > With another REGEX-implementation we uses (?=.{13})\d{1,5}( | > |\-)\d{1,7}\1\d{1,6}\1(\d|X). | > But this seem not to work. | > Only the shorter version "\d{1,5}( | |\\-)?\\d{1,7}\\1\\d{1,6}\\1(\d|X) | > " works, but how to check the 13 digits? | | I didn't try to figure out why this isn't working, but you | might have a look | at the site below -- it has a few examples of regex'es for | ISBN validation: | | http://regexlib.com/Search.aspx?k=ISBN | | HTH, | | Jeff | _______________________________________________ | Unsubscribe & other changes: | http://lists.boost.org/mailman/listinfo.cgi/boost |