const regex = /^(10(\.(1?\d\d?|2([0-4]\d?|5[0-5])))(?2)|172\.(1[6-9]|2\d|3[0-2])(?2)|192\.168(?2))(?2)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(10(\\.(1?\\d\\d?|2([0-4]\\d?|5[0-5])))(?2)|172\\.(1[6-9]|2\\d|3[0-2])(?2)|192\\.168(?2))(?2)$', 'gm')
const str = `10.17.0.1
`;
// 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