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ISBN Regular Expression

Posted on 2004-08-09
Medium Priority
Last Modified: 2012-06-21
I've got the following code:

function validateISBN(isbn)
      if(isbn.length <= 0)
            return true;
      var expression = new RegExp("(?=.{13}$)\d{1,5}([- ])\d{1,7}\1\d{1,6}\1(\d|X)$");

      if (!expression.test(isbn) )
            return false;      
            return true;

but it doesn't appear to work properly. I've taken the RegExp from some ASP code but I'm still very new at this and was wondering if anyone could see where I was going wrong?

Question by:Steven O'Neill
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LVL 63

Expert Comment

ID: 11751705
You are wrong with teh escape character back slash.
If you need one escape character then you need to write two of them.
That is only in String.
To avoid the problem creat the RegExp in its short form.
Like this:
 var expression = /(?=.{13}$)\d{1,5}([- ])\d{1,7}\1\d{1,6}\1(\d|X)$/;

LVL 63

Accepted Solution

Zvonko earned 500 total points
ID: 11751724
In oposite to the short form does the String parameter form looks like this:
 var expression = new RegExp("(?=.{13}$)\\d{1,5}([- ])\\d{1,7}\\1\\d{1,6}\\1(\\d|X)$");


Author Comment

by:Steven O'Neill
ID: 11751773

I'm sure the short form works but I've used thge string parameter form.

LVL 63

Expert Comment

ID: 11751796
Thanks for points.

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