const regex = /(?xm) (?(DEFINE) (?<byte> 2[0-4]\d | 25[0-5] | 1\d\d | [1-9]?\d) ) ^ (10 (?:\.(?&byte)){3} | 172 \. (?: 1 [6-9] | 2\d | 3[01] ) (?:\.(?&byte)){2} | 192 \. 168 (?:\.(?&byte)){2} | ) $/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?xm) (?(DEFINE) (?<byte> 2[0-4]\\d | 25[0-5] | 1\\d\\d | [1-9]?\\d) ) ^ (10 (?:\\.(?&byte)){3} | 172 \\. (?: 1 [6-9] | 2\\d | 3[01] ) (?:\\.(?&byte)){2} | 192 \\. 168 (?:\\.(?&byte)){2} | ) $', 'g')
const str = `10.0.0.0
10.1.2.3
10.255.255.255
172.16.0.0
172.25.1.2.3
172.31.255.255
12.34.56.78
123.456.789.0
192.168.0.555
192.168.0.0
192.168.1.2
192.168.255.255
`;
// 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