Read sieve conf file in php

I am migrating our mail platform,

I have for each user a file (I don't have access to Sieve host)

that looks like this

require "vacation";
if not header :contains "Precedence" ["bulk","list"] {
vacation
:days 15
:addresses ["some@email.tld", "some@email.tld"]
:subject "Out of office Subject"
"Some out of office tekst

With multiple lines 

another line"
;}

I want to get the subject and message in PHP as a variable for each. How can accomplish this?

A solution without regex looks like this:

<?php

$input = file_get_contents("input");

$needle = ":subject";

$theString = substr($input, strpos($input, $needle) + strlen($needle));

$newLinePosition = strpos($theString, "\n");

$subject = substr($theString, 0, $newLinePosition);

$content = substr($theString, $newLinePosition + 1);

echo "SUBJECT IS \n" . $subject . "\n";

echo "CONTENT IS \n" . $content . "\n";

Explanation:

• we load the contents of the file into $input (you can loop an array of filenames, of course)
• we define our needle, which is :subject, our useful content starts from the end of this needle up until the end of the string
• we extract the useful content and store it into $theString
• we find the first newline's position inside our useful content, knowing that the subject is before it and the content is after it
• we extract the subject and the content into their own variables
• we output these values