Change the data while changing table

Hi in my current projet i have a feature that allow the user to switch rows from one tab to another, so far it's working as intended.

What i want to do now is to check the .data() and do something depending on what's in the first column, but so far when i use.data, i get a long string of the whole TH row and i can't see to be able to split it to get the first value.

I use this piece of code to swap lines from one tab to the next :

var addRow = rulesTable.row($row);
caractTable.row.add(addRow.data()).draw();
addRow.remove().draw();
value = addRow.data();

Anyone who could help me achieve this ?