JS PreProc Task: Extract value and set header

Using Regex to extract a specific value from the subject and set as a new header value

If you want to retrieve specific text from the email subject then you can do so by searching the email subject with a Regular Expression that will extract the matching values. The below example will search the email subject for specific content and if found it will then set the value to the relevant email header.

Example Script:

var pattern = new RegExp("example:\\s([0-9]+)").exec(message.getSubject());
if (pattern !== null)
{
    print("Matched Value: " + pattern[1]);
    message.setHeader('example', pattern[1]);
}

Example Test Case:

MIME-Version: 1.0
Received: by 10.223.112.12 with HTTP; Sat, 18 Jun 2011 22:42:26 -0700 (PDT)
Date: Sun, 19 Jun 2011 17:42:26 +1200
Subject: CHANGE_SUBJECT!!! example: 10
From: "ryan example (ryan@example.com)" <system@external.com>
To: test@test.com
Content-Type: text/plain; charset=UTF-8

This is the email body

Test Script:

assert.equal(message.getHeader("example"), '10', 'example header value not found');