<?php
$text = "You have been assigned to the job #3 Megastar 4(01923033)
OSD jackpot needs adjusting.
The job is for Icon's Stadium Bar - GMV1028.
The job machines are - 01980414 , - 01923033 , - 07993682
This job has a priority of Non-Critical Fault / Medium.
The job is scheduled for Monday, 14 July, 2014 at 02:29 PM.";
preg_match_all("/(?<!\d)\d{8}?(?!\d)/", $text, $matches);
print_r($matches);
foreach($matches[0] as $SN_match){
print_r($SN_match);
}