在typescript中从正则表达式生成随机字符串

function generateRandomString(regex: RegExp, length: number): string {
  let result = '';
  const validChars = [];

  // 根据正则表达式找到字符集
  for (let i = 0; i < 256; i++) {
    const char = String.fromCharCode(i);
    if (regex.test(char)) {
      validChars.push(char);
    }
  }

  // 生成随机字符串
  while (result.length < length) {
    const randomIndex = Math.floor(Math.random() * validChars.length);
    result += validChars[randomIndex];
  }

  return result;
}

// 示例用法
const regex = /^[a-z0-9]+$/;  // 正则表达式匹配小写字母和数字
const length = 10;  // 生成的字符串长度为10
const randomString = generateRandomString(regex, length);

console.log(randomString);