02. Rage Quit (RegEx)

function solve(input) {
  let line = input.slice(0).shift();

  let pattern = /(?<symbols>[^\d]+)(?<number>\d+)/gm;
  let symbolSet = new Set();
  let matches = Array.from(line.matchAll(pattern));
  let output = [];

  if (matches.length > 0) {
    for (const match of matches) {
        if(Number(match[2]) !== 0){
            let currentMatch = match[1].toUpperCase().repeat(Number(match[2]));
            output.push(currentMatch);
            match[1].split("").forEach(symbol => {
                symbolSet.add(symbol.toUpperCase());
              });
            }
        }
  }
  console.log(`Unique symbols used: ${Array.from(symbolSet).length}`);
  console.log(output.join(""));
}