const regex = /.*Disconnected from (invalid |authenticating )?user .* [^ ]+ port [0-9]+( \[preauth\])?$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('.*Disconnected from (invalid |authenticating )?user .* [^ ]+ port [0-9]+( \\[preauth\\])?$', 'gm')
const str = `Jan 17 08:49:00 thesquareplanet.com sshd[2744]: Disconnected from invalid user wp-user 89.134.42.194 port 38866 [preauth]
Jan 17 03:13:00 thesquareplanet.com sshd[2631]: Disconnected from invalid user Disconnected from 46.97.239.16 port 55920 [preauth]
Jan 17 10:00:29 thesquareplanet.com sshd[2775]: Disconnected from user jon 18.26.4.53 port 39872`;
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