const regex = /^(?:(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])$/mg;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?:(?:\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])\\.){3}(?:\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])$', 'mg')
const str = `0.0.0.0
1.1.1.1
9.9.9.9
10.10.10.10
99.99.99.99
100.100.100.100
199.199.199.199
200.200.200.200
255.255.255.255
256.256.256.256
1.1.1.1.1
foo.bar.baz.qux`;
// 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