gistfile1.txt

// regexp split but keep match in array
function regexSplitKeep(re, s) {
  re.lastIndex = 0;
  let prevLastIndex = 0;
  let parts = [];

  for (let m = null; (m = re.exec(s)); ) {
    if (prevLastIndex !== -1 && m.index !== prevLastIndex) {
      parts.push(s.substr(prevLastIndex, m.index - prevLastIndex));
    }
    parts.push(s.substr(m.index, re.lastIndex-m.index));
    prevLastIndex = re.lastIndex;
  }
  if (prevLastIndex < s.length) {
    parts.push(s.substr(prevLastIndex));
  }

  return parts;
}