ISBN NO(For Book) Validation In Asp.Net

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what is ISBN NO(FOR Book)proper validation(Regular expression validation)n asp.net.
As Ex:-978-0-12-345678-9
978-0-12-345678-9
978-1-234-56789-7
9781234567897
978 1 234 56789 7
Plz Help me
Thanks In advance

Posted 26-Dec-12 6:57am

Dheerendra Dwivedi

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Sandeep Mewara 26-Dec-12 13:16pm

have you tried to write a regular expression for it by yourself so far?

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OriginalGriff · Answer 1 · 2012-12-26T08:46:00

You can't properly check an ISBN with a regex - the number contains a check digit which a proper validation should verify.
Because this requires a calculation, you cannot verify it with a regex - you need to use code.

You can do a simple validation to check it has the right number of digits and ignore the spaces/hyphens but that's about all you can do.

**Zoltán Zörgő** · Answer 2 · 2012-12-26T09:12:00

As Griff mentioned, it is not the way to do it. For pure syntactical validation, see these ones: http://regexlib.com/Search.aspx?k=ISBN&AspxAutoDetectCookieSupport=1[^]

In theory, since calculation is just a symbol manipulation, and we have look-around in regexp, I think it could be done. But it would be a hell of an expression :) Maybe I will try to do it sometimes. But until than you will need to use a CustomValidator[^].

The checksum calculation logic can be found here: http://en.wikipedia.org/wiki/International_Standard_Book_Number[^]

ISBN NO(For Book) Validation In Asp.Net

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