const regex = /(?<!\S)(?:(?:[1-9]?\d|1\d\d|2[0-4]\d|25[0-5])\.?\b){4}(?!\S)/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?<!\\S)(?:(?:[1-9]?\\d|1\\d\\d|2[0-4]\\d|25[0-5])\\.?\\b){4}(?!\\S)', 'g')
const str = `Validating IP V 4
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
5.5.5.5
6.6.6.6
7.7.7.7
8.8.8.8
9.9.9.9
10.10.10.10
A single character of: a, b or c
`;
// 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