Find/Change cell style with GREP

Hi All, (my first post here)

I found a handy script on this forum to find/change cell styles in a table. I adapted the script using Peter Kahrel's ebook for use with a GREP query.

I've linked a spreadsheet in InDesign CC 2014 that I want to highlight the cell of new products that contain the value .

When I run the script below I am getting random results.

var myDoc = app.activeDocument

app.findGrepPreferences = app.changeGrepPreferences = null

app.findGrepPreferences.findWhat = "\[\u\]"

var myFound = myDoc.findGrep()

for(i=0; i<myFound.length; i++)

{

    if(myFound.parent.constructor.name == "Cell")

    {

   myFound.parent.appliedCellStyle = "New_Product_Cell"

    }

}