const regex = /(?:(?:25[0-5]|(?:2[0-4]|1[0-9]|[1-9]|)[0-9])(?:\.(?!$)|$)){4}/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:(?:25[0-5]|(?:2[0-4]|1[0-9]|[1-9]|)[0-9])(?:\\.(?!$)|$)){4}', 'gm')
const str = `validates:
0.0.0.0:0
255.0.0.0
192.168.1.0:8080
does not validate:
192.168.0.0/24
192.168..1
192.168.1`;
// 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