const regex = /^((?=[0-9.]+$)((25[0-5]|(2[0-4]|1[0-9])[0-9]|[1-9]?[0-9])\.){3}(25[0-5]|(2[0-4]|1[0-9])[0-9]|[1-9]?[0-9])|(?=[0-9.]*[a-zA-Z])([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9])((\.([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9]))*(\.[a-zA-Z]{2,31}))+)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^((?=[0-9.]+$)((25[0-5]|(2[0-4]|1[0-9])[0-9]|[1-9]?[0-9])\\.){3}(25[0-5]|(2[0-4]|1[0-9])[0-9]|[1-9]?[0-9])|(?=[0-9.]*[a-zA-Z])([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9])((\\.([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9]))*(\\.[a-zA-Z]{2,31}))+)$', 'gm')
const str = `127.0.0.1
192.168.1.1
192.168.1.255
192.168.255.255
0.0.0.0
127.0.0.1
192.168.1.1a
192.068.1.255
30.168.1.255.1
127.1
192.168.1.256
-1.2.3.4
1.1.1.1.
3...3
toto.fr
truc-bidule.com
sub.truc-bidule.toto.com
toto
toto.f
toto.f6
-3.fr
toto.fr
truc_bidule.com
sub..truc-bidule.toto.com
`;
// 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