javascript regex for whitespace or  

I am looking for a javascript regex for whitespace. I am checking several different string in a loop and I need to locate the strings that have the big white space in them.

The white space string is built in a loop, like this...

please read this code as var whitespace = " " then the loop just concats more non breaking spaces on it.

var whitespace = " "

        for (var x = 0; x < 20; x++) {
            whitespace += "&nbsp;"
        }

then it is used later on in a string concat.

sometext += whitespace + someData;

I need to identify the strings that contain whitespace (20 spaces).

Or should I just be doing a contains(whitespace) or something similar.

Any help is appreciated.

Cheers, ~ck in San Diego