Get locale-based number formatting options in JavaScript

getNumberSeparators.js

// https://codepen.io/nkalvi/pen/MWZpzOg

// Get separator symbols as .decimal and .thousands
// for given locale or default locale
function getNumberSeparators(locale) {
  const str = (1234.56).toLocaleString(locale);
  const regex = /\p{Nd}(?<thousands>[^\p{Nd}]?)\p{Nd}{3}(?<decimal>[^\p{Nd}]?)\p{Nd}{2}/u;
  const found = str.match(regex);

  if (!found || !found.groups) return undefined;
  return found.groups;
}