const regex = /\b(?:(?:25[0-5]|2[0-4][0-9]|1?[1-9][0-9]?|10[0-9])(?:(?<!\.)\b|\.))(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:(?<!\.)\b|\.)){3}/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\b(?:(?:25[0-5]|2[0-4][0-9]|1?[1-9][0-9]?|10[0-9])(?:(?<!\\.)\\b|\\.))(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:(?<!\\.)\\b|\\.)){3}', 'g')
const str = `Match on VALID IP address anywhere in string.
192.1683.0.1 1.1.1.256 3.2.6.2351 300.3.3.3 192.168.10.10 127.0.0.999
255.255.256.255 255.255.255.2555 100.0.0.1 1000.0.0.1
192.168.10.10
100.0.0.1`;
// 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