04.Santa's Secret Helper (RegExp)

function solve(input) {
  let key = Number(input.shift());
  let pattern = /@([A-Za-z]+)[^-@!\:>]*!([G])!/gm;
  for (const word of input) {
    if (word === "end") {
      break;
    }
    let result = "";
    for (const letter of word) {
      result += String.fromCharCode(letter.charCodeAt() - key);
    }
    if (Array.from(result.matchAll(pattern)).length > 0) {
      let behavior = Array.from(result.matchAll(pattern))[0][2];
      let name = Array.from(result.matchAll(pattern))[0][1];
      console.log(name);
    }
  }
}