JSFiddle - React, Tailwind, and code Playground
JavaScript
var line = "RIGHT; 4; 4 0 2 0|0 0 0 8|4 0 2 4|2 4 2 2";
var elements = line.split("; ");
var matrice = [];
elements[2].split("|").forEach(function(e,i) {
matrice[i] = e.split(" ");
});
console.log(matrice)