Convert a string of comma separated numbers into a 2D array

I have a string of numbers like so:

var original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447";

And I wish to convert this string into a 2D array like so:

[[547, 449] [737, 452] [767, 421] [669, 367] [478, 367] [440, 391] [403, 392] [385, 405] [375, 421] [336, 447]]

But I'm having trouble doing it. I tried using regex:

var result = original.replace(/([-\d.]+),([-\d.]+),?/g, '[$1, $2] ').trim();

But the result was a string of the following and not an array:

[547, 449] [737, 452] [767, 421] [669, 367] [478, 367] [440, 391] [403, 392] [385, 405] [375, 421] [336, 447]

Might be easier to use a global regular expression to match two segments of digits, then split each match by comma and cast to number:

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var original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447";

const arr = original
  .match(/\d+,\d+/g)
  .map(substr => substr.split(',').map(Number));
console.log(arr);

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You could use split and reduce methods with % operator to create the desired result.

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var original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447";
const result = original.split(',').reduce((r, e, i) => {
  if (i % 2 == 0) r.push([]);
  r[r.length - 1].push(e);
  return r;
}, [])

console.log(result)

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You could look for digits with a comma in between, replace, add brakets and parse as JSON.

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var original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447",
array = JSON.parse('[' + original.replace(/\d+,\d+/g, '[$&]') + ']');

console.log(array);

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This could be a nice use case for using .matchAll():

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var original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447";

var array = Array.from(original.matchAll(/(\d+),(\d+)/g), 
                       ([, ...m]) => m.map(Number));

console.log(array);

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Using Regex and JSON.parse are costlier. Do it using array to matrix as below

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const original = "547,449,737,452,767,421,669,367,478,367,440,391,403,392,385,405,375,421,336,447";

const arrayToMatrix = (array, columns) => Array(Math.ceil(array.length / columns)).fill('').reduce((acc, cur, index) => {
  return [...acc, [...array].splice(index * columns, columns)]
}, []);

const result = arrayToMatrix(original.split(','),2);

console.log(result);

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