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
>
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