detect keyword and add class

detect keyword and add class

I want detect if the column has red or blue, add the class on it, it's like
  1.     $('table tr').each(function() {
            $(this)
                .find('td:contains("red")')
                    .addClass('red')
                .end()
                .find('td:contains("blue")')
                    .addClass('blue');
        });







but I want every column 2 below red column and column 3 below blue also add the same css, how to do it?

    red  blue
0 1 2 3
0 1 2 3
0 1 2 3