Find content in cell and apply cell style across the entire ROW

This also seems to work at least on the provided sample:

 

 

function applyCellStylesToRows() {
    var doc = app.activeDocument;
    var weekendCellStyle = doc.cellStyles.itemByName("Weekend");
    var bankHolidayCellStyle = doc.cellStyles.itemByName("BankHoliday");
    var c = doc.stories.everyItem().tables.everyItem().cells.everyItem().getElements();
    var s;
    for (var i = 0; i < c.length; i++){
       if (c[i].contents.match(/\b\d{1,2}x\b/i)) {
            s =  weekendCellStyle   
       }else if (c[i].contents.match(/\b\d{1,2}Y\b/i)) {
            s = bankHolidayCellStyle
       }
       c[i].appliedCellStyle = s
    };   
}

app.doScript(applyCellStylesToRows, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Apply Cell Styles');

 

By @rob day

But @stevecole wants to style the entire ROW - not just a single Cell.