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
>>
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>
>