使用RegExp匹配括号,然后递增它

function incrementBrackets(str) {
  const regex = /\(([^)]+)\)/;
  const matches = str.match(regex);

  if (matches) {
    const num = parseInt(matches[1], 10);
    const incremented = num + 1;
    return str.replace(regex, `(${incremented})`);
  }

  return str;
}

const input = "Hello (1) World!";
const output = incrementBrackets(input);
console.log(output); // 输出 "Hello (2) World!"