const regex = /(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}', 'gm')
const str = `IP=FE80:0000:0000:0000:0202:B3FF:FE1E:8329 message='Hey&son' user=mother
IP=192.23.33.40 message='Hi&mom!' user=child0
IP=192.23.30.40 message='Hi&from&me&too' user=child1
IP=192.23.30.42 message='spam' user=destroyer
IP=192.23.30.42 message='spam' user=destroyer
IP=192.23.50.40 message='' user=yetAnotherUsername
IP=192.23.50.40 message='comment' user=yetAnotherUsername
IP=192.23.155.40 message='Hello.' user=unknown
end
`;
// 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