Does anyone know why "x" .split (/ (x) /). Does length return 0 in IE?

Question

In IE, "x".split(/(x)/).length returns 0

In Firefox, Chrome, Safari and Opera 3 returned.

Does anyone know the reason? If possible, a link will be appreciated.

I believe this is an IE regex implementation problem, but I cannot find any document about this.

Answer 1

You are right that there are problems with the implementation. IE ignores empty values ​​and blocks blocks in regular expressions.

So for

 "foo".split(/o/) 

IE gives

 [f] 

where other browsers give

 ["f","",""] 

and when adding capture:

 "foo".split(/(o)/) 

IE does the same, but the rest add the captured delimiter to the resulting array to give

 ["f","o","","o",""] 

So, unfortunately, you probably need to avoid using split or code to solve these problems.

Answer 2

Here, for example, http://blog.stchur.com/2007/03/28/split-broken-in-ie/

Answer 3

I had the same issue with a broken IE split implementation.

Here is a small library file that fixed the problem perfectly.