const regex = /\b(1?(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.){3}(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\b/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\b(1?(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\\.){3}(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\\b', 'g')
const str = `192.168.1.1
127.0.0.1
256.548.0.1
255.255.255.0
192.168.123.1
0.1
123.4
19864.684.1
123.123.123
123.123.260.123
`;
// 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