Regular Expression for ISBN

Posted on 2008-10-31
Last Modified: 2010-04-21
Hi Friends,

I having an ISBN regular expression ISBN\x20(?=.{13}$)\d{1,5}([- ])\d{1,7}\1\d{1,6}\1(\d|X)$
but it only matches to these three formats ISBN 0 93028 923 4,ISBN 1-56389-668-0
and ISBN 1-56389-016-X.

I found some serious like this ISBN 1847193579 and ISBN 13 978-1-847193-57-5.

So can anybody suggest a better expression?

Question by:logicslab
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LVL 39

Expert Comment

by:Roger Baklund
ID: 22848915
Maybe you can use something simpler, like ISBN followed by any combination of digits, dashes and spaces, optionally ending with X?

ISBN[ -\d]+X?

Author Comment

ID: 22849620
Sorry ISBN[ -\d]+X? will not work. It will allow
"ISBN sds sdds 13 978-1-847193-57-5 ssdsd"

Expert Comment

ID: 22849682
* my solution:

* Short explanation:

1) match IBSN or IBSN 13 with/without hyphens/spaces, non-backreferencing

2) first backreference group, \1, check for IBSN 13 prefix (978 or 979)

3) check length of remaining (max 9 digits + 1 digit or X, max 3 total punctuation (- or space) )

4) second backreference, \2, 'group identifier' , i.e. language

5) third backreference, \3, publisher

6) fourth backreference, \4, item number

7) final backreference, \5, checksum number

8) end of line / string

** Sample replacement string

ISBN 978-\2-\3-\4-\5

-- This will output any given IBSN in the 'new' 13 digit format. Although, if the ISBN is given as a string without punctuation, it will just make a reasonable guess on where the hyphens should be placed
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LVL 51

Expert Comment

ID: 22849896
> but it only matches to these three formats ISBN 0 93028 923 4,ISBN 1-56389-668-0
hmm, 1-56389-668-0 seems not to be a valid ISBN number should be 1-56389-668-11

So is your goal just to match the correct format or to verify if it is valid?
LVL 39

Expert Comment

by:Roger Baklund
ID: 22849981
ISBN[ -\d]+X? will not match "ISBN sds sdds 13 978-1-847193-57-5 ssdsd", but it will match "ISBN " in this case. You could add a requirement for a minimum number of digits.
LVL 16

Expert Comment

ID: 22850740
by Michael Ash:
ISBN\x20(?=.{13}$)\d{1,5}([- ])\d{1,7}\1\d{1,6}\1(\d|X)$

Author Comment

ID: 22874522

i want use this regular expression with javascript. So how can i use this expression


it is too wide

Accepted Solution

bitter_chicken earned 500 total points
ID: 22883565
I'm not sure what you mean about too wide. The attached code snippet works for me. Post your code if you have further problems.
var restring = /ISBN[\x20\x2D]{0,1}(?:13[\x20\x2D]{0,1}){0,1}(978[\x20\x2D]|979[\x20\x2D]|)(?=[0-9\x20\x2D]{9,12}[0-9xX]$)(\d{1,5}?)[\x20\x2D]{0,1}(\d{1,7})[\x20\x2D]{0,1}(\d{1,6}?)[\x20\x2D]{0,1}([0-9xX])$/;
var re = new RegExp(restring);
var subj = "ISBN 13 978-1-847193-57-5";
  if (subj.match(re)) {
    alert("Successful match");
  } else {
    alert("No match");

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Author Comment

ID: 22902391
thank you.

It is working now :)

Author Closing Comment

ID: 31511987

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