const hexToRgb = hex => hex.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i ,(m, r, g, b) => '#' + r + r + g + g + b + b) .substring(1).match(/.{2}/g) .map(x => parseInt(x, 16)) console.log(hexToRgb("#0033ff")) // [0, 51, 255] console.log(hexToRgb("#03f")) // [0, 51, 255]
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