const regex = /(?![\d.]+)((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\.(xn--)?([a-z0-9\._-]{1,61}|[a-z0-9-]{1,30})/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?![\\d.]+)((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\\.(xn--)?([a-z0-9\\._-]{1,61}|[a-z0-9-]{1,30})', 'gm')
const str = `www.example.com
subdomain.example.com
subdomain.example.co.uk
192.168.0.0
127.0.0.1
Lucia told me about www.example.com. However, whenever I visit the site the IP 127.0.0.1 shows up.`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions