Tableviewer one text multiple filteroptions

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Java

table

I have problem regarding my Filtering of my Table. I'm using a ViewerFilter and override the select Method to fitler that Table. The Filtertext itself is entered via a Textfield.

So now to my problem. For example my table looks like the following:

column
123
124

In my textfield the user can enter the columnname=data1,data2 to show all rows which have either data1 or data2 as data. so in my above example if the user enters column=123,124 both rows should still be visible. The problem here is that I refresh my tableviewer after each entered character. So when the user enters column=123 the Table only shows one column. When adding ,124 to the filtertext I filter my already filtered table. So no data gets shown at the end. How can I still filter the original Tabledata?

@Override
   public boolean select(final Viewer viewer, final Object parentElement, final Object element) {
       final String filterString = filterText.getText().toLowerCase();
       if (filterString.length() == 0) { return true; }

       final mydata myData= (mydata) element;
       if (filterString.matches("columnName" + ".+")) {
       index = filterString.indexOf("columnName" + ".+");
      evaluateText(myData, filterString, i, index + tableColumnsText[i].length())
   }

   public boolean evaluateText(final mydata data, final String filterText, final int beginningIndex) {
           subString = filterText.substring(beginningIndex, filterText.length());
           return evaluateString(data.getString(), subString);
   }


   public boolean evaluateString(final String cellString, final String commaString) {
       int countSubstrings = 0;
       final String[] items = commaString.split(",");
       countSubstrings = items.length;

       for (final String s : items) {
           if (s.length() != 0) {
               if (!cellString.contains(s)) { return false; }
           }
       }
       return true;
   }

So I tried to filter out the main components of the method. Does someone have an idea how to solve this problem?