I would like to use the tool "select lines that match an expression", but without applying it to the entire line, but only on the first column, while keeping the entire line. So that the tool is called something like "select column that match an expression".
The problem is I just want to separate lines by their value on first column. All lines with column1=1 is the first set, then all lines with column1=2 is second set, etc. I can't use "select lines matching expression", because the second column has numeric values like 1 or 2, as in column 1, but in different order.
Any idea how to do that?