Decompress A Given String

decodeString.js

// An alternate solution for this challenge
// https://www.adimation.info/2019/12/01/decompress-a-given-string

function decodeString(str) {
  let res = '';
  const letters = str.split(/[0-9]+/).join('').split('');
  letters.forEach(v => {
    if (str.match(new RegExp(`${v}[0-9]+`))) {
      res += v.repeat(str.match(new RegExp(`${v}[0-9]+`))[0].split(v)[1]);
    } else {
      res += v;
    }
  })

  return res;
}
console.log(decodeString('a2b2c2')); // aabbcc
console.log(decodeString('a3bc4d10')); // aaabccccdddddddddd
console.log(decodeString('a0b0c0dd')); // dd
console.log(decodeString('A10')); // AAAAAAAAAA