Convert regex matches to an object

parseRgx.js

const parseRgx = rgx => s => {
  const keys = ['_global', ...rgx.match(/\$(\w+):/g).map(k => k.replace(/\$|:/g,''))];
  const matches = s.match(new RegExp(rgx.replace(/\$\w+:/g,''))) || [];
  return matches.reduce((res, val, i) => Object.assign({}, res, { [keys[i]]: val }), {});
};

const parseEmail = parseRgx('($user:\\w+)@($domain:\\w+)\\.(?:\\w+)');

parseEmail('foo@bar.com'); // { _global: "foo@bar.com", domain: "bar", user: "foo" }