function matchOverlap(input, re) {
  var r = [],
    m;
  // prevent infinite loops
  if (!re.global) re = new RegExp(
    re.source, (re + '').split('/').pop() + 'g'
  );
  while (m = re.exec(input)) {
    re.lastIndex -= m[0].length - 1;
    r.push(m[0]);
  }
  return r;
}

function algorithm(pattern, s) {
  const VOWELS = 'aeiouy'

  if (pattern.match('[^01]'))
    throw new Error('only 0 and 1 allowed in pattern')
  else if (s.match('[^a-z]'))
    throw new Error('only a-z allowed in s')

  const generatedRegex = new RegE