获取特定字符之间的替换

function replaceBetween(str, startChar, endChar, newContent) {
  const regex = new RegExp(`${startChar}[^${endChar}]*${endChar}`, 'g');
  return str.replace(regex, `${startChar}${newContent}${endChar}`);
}

const originalString = 'Hello [world], how are [you] today?';
const newString = replaceBetween(originalString, '[', ']', 'everyone');
console.log(newString); // Output: Hello [everyone], how are [everyone] today?