What is any regular expression that matches and capture a multiline string predeced by an undefined number of new lines? [PCRE]

I have this multi-line string:

Lorem ipsum dolor sit amet.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus
dictum, lorem et fringilla congue, velit libero sagittis eros, id
lobortis nisi risus ac mauris.

I would like to use PHP Compatible Regular Expression to “name capture” the second “paragraph” (the 3-line text after the new line).

I tried the following regular expression on regex101 and it works fine :

/n(n)+(?<namedGroup>([wd]+.*(n)?)+)/m

but when I tried it in PHP using the following code, nothing gets captured :

<?php
$text = file_get_contents("paragraphs.txt");

$regular_expression = '/n(n)+(?<namedGroup>([wd]+.*(n)?)+)/m';

preg_match($regular_expression, $text, $result);
print_r($result);
?>