合法域名校验出错

function isValidDomain(domain) {
    const domainRegex = /^(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}\.?|[a-zA-Z0-9](?:[a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.?)$/;
    return domainRegex.test(domain);
}

const dns = require('dns');

function checkDomainDns(domain) {
    return new Promise((resolve, reject) => {
        dns.resolve4(domain, (err, addresses) => {
            if (err) {
                reject(err);
            } else {
                resolve(addresses);
            }
        });
    });
}

checkDomainDns('example.com')
    .then(addresses => console.log(addresses))
    .catch(err => console.error(err));

const https = require('https');

function checkSslCertificate(domain) {
    return new Promise((resolve, reject) => {
        const req = https.get(`https://${domain}`, (res) => {
            const cert = res.socket.getPeerCertificate();
            if (cert && cert.subject && cert.issuer) {
                resolve(cert);
            } else {
                reject(new Error('Invalid SSL certificate'));
            }
        });

        req.on('error', (err) => {
            reject(err);
        });
    });
}

checkSslCertificate('example.com')
    .then(cert => console.log(cert))
    .catch(err => console.error(err));