I have a javascript file that is used to sort my html table. All of the standard data types are being sorted correctly. For example, I have columns of numbers, alphanumeric characters, and dates that are all being sorted correctly.

One of my columns displays data that needs to be sorted a different way. Example cells look like:

3 X 4
2 X 5
1 X 3

Does the above data fit this regular expression? /[0-9]\s[A-Z]\s[0-9]/
Or, is there a better one that I should use to match the data type?

After I match the data type, I move to the sorting function. What I want to do is compare to cells, and swap them if necessary based on a condition. So, if I have the following two cells (a) and (b):

a = 3 X 4
b = 4 X 3

first what I do is multiply the first number by the second. So, the product of a is 12 and the product of b is 12. Usually, I would want to sort by product, but when the product is the same I want to sort by whichever cell has the greatest second number (a in this case).

Here is my sorting function:

Code:
sort_lxc: function(a,b) {
    var a_array = str.split(" ");
    var b_array = str.split(" ");

    alert("a_array = " + a_array);
    alert("b_array = " + b_array);

    var lxc_product1 = a_array[0] * a_array[2];
    var lxc_product2 = b_array[0] * b_array[2];

    if (lxc_product1 == lxc_product2) {
        if (a_array[2] > b_array[2]) {
            return -1;
        }
        if (a_array[2] < b_array[2]) {
            return 1;
        }
        if (a_array[2] == b_array[2]) {
            return 0;
        }
    }
    if (lxc_product1 < lxc_product2) return -1;
    return 1;
  }
The above function doesn't seem to work and I can't figure out why. I am fairly new to javascript so any help is appreciated. Thanks!