const regex = /^(?:(?:[0-9]{1,3}\.){3}[0-9]{1,3}(?:\/(?:[0-9]|[12][0-9]|3[0-2]))?|(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}(?:\/(?:[0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))?)$/mg;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?:(?:[0-9]{1,3}\\.){3}[0-9]{1,3}(?:\\\/(?:[0-9]|[12][0-9]|3[0-2]))?|(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}(?:\\\/(?:[0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))?)$', 'mg')
const str = `127.1.1.123
0000:0000:0000:0000:0000:0000:0000:0000
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
127.0.0.112
127.1.1.1/24
123.0.0.1/33
`;
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