js判断域名是否合法

function isValidDomain(domain) {
  const domainRegex = /^(?!-)[a-zA-Z0-9-]{1,63}(?<!-)(?:\.[a-zA-Z0-9-]{1,63}(?<!-))*\.[a-zA-Z]{2,63}$/;
  return domainRegex.test(domain);
}

// 测试示例
console.log(isValidDomain("example.com")); // true
console.log(isValidDomain("example-.com")); // false
console.log(isValidDomain("-example.com")); // false
console.log(isValidDomain("example..com")); // false
console.log(isValidDomain("example.com.")); // false

const punycode = require('punycode');

function isValidDomain(domain) {
  const asciiDomain = punycode.toASCII(domain);
  const domainRegex = /^(?!-)[a-zA-Z0-9-]{1,63}(?<!-)(?:\.[a-zA-Z0-9-]{1,63}(?<!-))*\.[a-zA-Z]{2,63}$/;
  return domainRegex.test(asciiDomain);
}