JTable regexFilter right int to filter first column?

Question

what number in the regexFilter constructor for a JTable do i need to filter the first column? 0 or 1? e.g.

 ArrayList<RowFilter<Object,Object>> filters = new ArrayList<RowFilter<Object,Object>>(3);
    TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(); 
    if(!fa.getCaseID().equals("*CASEID*")){
        filters.add(RowFilter.regexFilter(fa.getCaseID(),0));//filter first column
    }
    if(!fa.getState().equals("*ANY*")){
        filters.add(RowFilter.regexFilter(fa.getState(),4));//filter fifth column 
    }
    RowFilter<Object,Object> filter = RowFilter.andFilter(filters);
            sorter.setRowFilter(filter); 
            mTable.setRowSorter(sorter);

Answer 1

This is a little tricky because it's not explicitly stated in the RowFilter.regexFilter() docs, but you can infer from this snippet:

Throws:

NullPointerException - if regex is null
IllegalArgumentException - if any of the indices are < 0
PatternSyntaxException - if regex is not a valid regular expression.

Even 0 is a legal argument. Consequently the first column would be 0.