greedy js reg ex

greedy-regex.js

// https://stackoverflow.com/questions/49744804/how-to-match-an-overlapping-pattern-multiple-times-using-regexp
// the problem is that by default regexp cant do overlapping patterns
// for example we want: "eighthree" -> ['eight', 'three'] and for "sevenine" -< ['seven', 'nine']
// but with default .match we get "eighthree" -> ['eight'] and for "sevenine" -> ['seven']

const greedyRegex = (str: string) => {
  let reg = /one|two|three|four|five|six|seven|eight|nine|\d/g,
    next = reg.exec(str),
    res = [];

  while (next) {
    res.push(next[0]);
    reg.lastIndex = next.index + 1;
    next = reg.exec(str);
  }

  return res;
};

const res = greedyRegex("sevenineight323") ->  ['seven', 'nine', 'eight', '3', '2', '3']