Getting CSS variables while inside Javascript not working [duplicate]

I have 2 css variables “–nav-color” and “–link-color” but it only console.logs my –nav-color only.

let regex = new RegExp('--', 'gim');
for (let i of Array.from(getComputedStyle(document.documentElement))) {
  if (regex.test(i)) {
    console.log(i); 
  }
}

i tried multiple methods and one of them is placing console.log(regex.test(i)) after the if but the problem is it also logged the false and true values.