const regex = /^X-Mimecast-Spam-Score\: \b([7-9]|[12][0-9])\b\nX\-Mimecast\-Spam\-Signature\: yes$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^X-Mimecast-Spam-Score\\: \\b([7-9]|[12][0-9])\\b\\nX\\-Mimecast\\-Spam\\-Signature\\: yes$', 'gm')
const str = `MIME-Version: 1.0
X-Mailer: WebService/1.1.19306 YMailNorrin
Authentication-Results: relay.mimecast.com;
dkim=pass header.d=yahoo.com header.s=s2048 header.b=XXXXXX;
dmarc=pass (policy=reject) header.from=yahoo.com;
spf=pass (relay.mimecast.com: domain of XXXXXX@yahoo.com designates 106.10.241.82 as permitted sender) smtp.mailfrom=XXXXXXXXXX@yahoo.com
X-Mimecast-Spam-Score: 15
X-Mimecast-Spam-Signature: yes
Content-Type: multipart/alternative;
boundary="----=_Part_966462_2108451314.1637042911940"
Content-Length: 55093`;
// 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