const regex = /([a-z0-9]{1,4}:+){3,5}[a-z0-9]{1,4}|(?<!id )(?<!\.)\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b(?!\.)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('([a-z0-9]{1,4}:+){3,5}[a-z0-9]{1,4}|(?<!id )(?<!\\.)\\b\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\b(?!\\.)', 'gm')
const str = `
from mail.example.com (example.com. [213.239.250.131]) by mx.google.com with ESMTPS id xc4si15480310lbb.82.2014.10.26.06.16.58 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 26 Oct 2014 06:16:58 -0700 (PDT)
Received: from ssservices1-1 (192.168.20.142) by mail.supershuttle.com (192.168.20.110) with Microsoft SMTP Server id 14.2.347.0; Tue, 21 Apr 2015
Received: from ssservices1-1 (192.168.20.142) by mail.supershuttle.com (192.168.20.110) with Microsoft SMTP (TLS) Server id 14.2.347.0; Tue, 21 Apr 2015
`;
// 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