Need to pull some data out of a string

Ok so I have documents containing specific data I would like to sort into a database.
The bit I'm now having trouble with is pulling the data from the string.

For example:

$string = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Donec sit amet: 7899942378
Nunc ornare nulla in quam tempus sed";

The number of lines before and after the data (in green) varies doc to doc, however "Donec sit amet: " before the data will always remain the same*, so I need to find the line containing "Donec sit amet: " then take what is left until the end of the line. EDIT: The length of the data also changes, e.g sometimes it's +1 or -1 the usual length.

*Actually there is some variation, but not a lot so I was going to either change it manually when I need to, or throw in an if statement.

I did try searching for this but couldn't come up with anything.

Thanks,
Scot

 

<?php
    $string = " Lorem ipsum dolor sit amet, consectetur adipiscing elit.
                Donec sit amet: 7899942378
                Nunc ornare nulla in quam tempus sed";
    
    preg_match("#Donec sit amet: (.*?)\r\n#i",$string,$matches);
    
    echo $matches[1];
?>

PHP:

 

Thanks!

 

Your welcome !