Link to home
Start Free TrialLog in
Avatar of logicslab
logicslab

asked on

Regular Expression for ISBN

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?

Regards
Avatar of Roger Baklund
Roger Baklund
Flag of Norway image

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

ISBN[ -\d]+X?
Avatar of logicslab
logicslab

ASKER

Sorry ISBN[ -\d]+X? will not work. It will allow
"ISBN sds sdds 13 978-1-847193-57-5 ssdsd"
* my solution:
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]$)(\d{1,5}?)[\x20\x2D]{0,1}(\d{1,7})[\x20\x2D]{0,1}(\d{1,6}?)[\x20\x2D]{0,1}([0-9xX])$

* Short explanation:

1) match IBSN or IBSN 13 with/without hyphens/spaces, non-backreferencing
ISBN[\x20\x2D]{0,1}(?:13[\x20\x2D]{0,1}){0,1}

2) first backreference group, \1, check for IBSN 13 prefix (978 or 979)
(978[\x20\x2D]|979[\x20\x2D]|)

3) check length of remaining (max 9 digits + 1 digit or X, max 3 total punctuation (- or space) )
(?=[0-9\x20\x2D]{9,12}[0-9xX]$)

4) second backreference, \2, 'group identifier' , i.e. language
(\d{1,5}?)[\x20\x2D]{0,1}

5) third backreference, \3, publisher
(\d{1,7})[\x20\x2D]{0,1}

6) fourth backreference, \4, item number
(\d{1,6}?)[\x20\x2D]{0,1}

7) final backreference, \5, checksum number
([0-9xX])

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

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

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]$)(\d{1,5}?)[\x20\x2D]{0,1}(\d{1,7})[\x20\x2D]{0,1}(\d{1,6}?)[\x20\x2D]{0,1}([0-9xX])$

it is too wide
ASKER CERTIFIED SOLUTION
Avatar of bitter_chicken
bitter_chicken
Flag of Australia image

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
thank you.

It is working now :)
:)