Search for a value in a single cell of csv file

So I have a csv file containing 4 columns, and I am using it to create card views. What I am trying to achieve here is a functioning “Save” button. So when a save button is pressed against that card view, I want the data from that row to be saved inside another csv file. I know there is an thing in list block. But it only searches if a row contains only a single value and returns false if multiple values. What is the best way to do this?

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