IPv4 Address

1const regex = /^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
2const str = '192.168.1.1';
3
4// Test if string matches
5const isMatch = regex.test(str);
6console.log('Match found:', isMatch);
7
8// Find all matches (add 'g' flag for multiple matches)
9const matches = str.match(regex);
10console.log('Matches:', matches);
11
12// Find matches with details
13let match;
14const regexWithGlobal = /^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/g;
15while ((match = regexWithGlobal.exec(str)) !== null) {
16  console.log('Match:', match[0], 'Index:', match.index);
17}