GitHub search knows all: https://github.com/zapnap/isbn_validation/blob/master/lib/isbn_validation.rb -Sean On 10/21/11 1:44 PM, "Kozlowski,Brendon" <[log in to unmask]> wrote: > Hi all. > > > > I'm somewhat surprised that I've never had to validate an ISBN manually up > until now. I suppose that's a testiment to all of the software out there. > > > > However, I now find that I need to validate both the 10-digit and 13-digit > ISBNs. I realize there's also a check digit and a REGEX cannot check this > value - one step at a time. Right now I just want to work on the REGEX. > > > > Does anyone know the exact specifications of both forms of an ISBN? The ISBN > organization's website didn't seem to be overly clear to me. Alternatively, if > anyone has a full working regular expression for this purpose I would > definitely not mind if they'd be willing to share. > > > > The only thing I'm doing which is abnormal is that I am not requiring the > hyphenation or spaces between numbers since some of this data will be coming > from a system, and some will be coming from human input. > > > > > Brendon Kozlowski > Web Administrator > Saratoga Springs Public Library > 49 Henry Street > Saratoga Springs, NY, 12866 >  584-7860 x217 > > Please consider the environment before printing this message. > > To report this message as spam, offensive, or if you feel you have received > this in error, > > please send e-mail to [log in to unmask] including the entire contents and subject > of the message. > > It will be reviewed by staff and acted upon appropriately.