Javascript中文本中的未知字符代码导致IndexOf函数返回-1

function safeIndexOf(text, target) {
  for (let i = 0; i < text.length - target.length + 1; i++) {
    let match = true;
    for (let j = 0; j < target.length; j++) {
      if (text.charCodeAt(i + j) !== target.charCodeAt(j)) {
        match = false;
        break;
      }
    }
    if (match) {
      return i;
    }
  }
  return -1;
}

const index = safeIndexOf("Hello 世界", "世界");
console.log(index); // 输出: 7

function safeIndexOf(text, target) {
  const regex = new RegExp(target.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'));
  return text.search(regex);
}

const index = safeIndexOf("Hello 世界", "世界");
console.log(index); // 输出: 7