So much duplication. If only there were some sort of organization that might
serve as a clearinghouse for this sort of code that's useful to libraries...

[Yes, I know the only appropriate response is, "Well, Dueber, step up and do
something about it." ]

On Mon, Oct 24, 2011 at 4:59 PM, Jon Gorman <[log in to unmask]>wrote:

> Also, I don't know OpenBook to know your source data, but don't forget
> a lot of publishers have printed ISBNs in different ways over the past
> few years.  The regex would choke on any hyphens.  If users are
> copying from printed material, they could type them in. For example,
> one of the books near my desk has the ISBN printed like  0-521-61678-6
>
> if this is user input and nothing is striping characters like that
> out, it could cause problems.
>
> (I think I've also seen spaces used instead of hyphens, but less
> positive about this).
>
> Jon Gorman
>
>
> On Mon, Oct 24, 2011 at 9:44 AM, Jonathan Rochkind <[log in to unmask]>
> wrote:
> > John: That's not going to work, an ISBN can end in "X" as a check digit,
> > which is not [0-9].  You are going to be rejecting valid ISBN's, you have
> a
> > bug.
> >
> > On 10/24/2011 10:40 AM, John Miedema wrote:
> >>
> >> Here's a php function I use in OpenBook to test if a user has entered a
> 10
> >> or 13 digit ISBN.
> >>
> >> //test if 10 or 13 digits ISBN
> >> function openbook_utilities_validISBN($testisbn) {
> >> return (ereg ("([0-9]{10})", $testisbn, $regs) || ereg ("([0-9]{13})",
> >> $testisbn, $regs));
> >> }
> >>
> >>
> >>
> >> On Fri, Oct 21, 2011 at 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
> >>> [518] 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.
> >>>
> >>
> >>
> >
>



-- 
Bill Dueber
Library Systems Programmer
University of Michigan Library