Joomla Table Class Fix Intro Text Splitter

<?php

$text = file_get_contents('dio.php');

$patternOld = '#<hr\s+id=("|\')system-readmore("|\')\s*\/*>?#i';
$pattern = '#(?:\s*<(?<tag>[\w-]+)>)?<hr\s+id=["\']system-readmore["\']\s*\/*>(?:<\/(?P=tag)>\s*)?#i';

$tagPos = preg_match($pattern, $text);
$tagPosOld = preg_match($patternOld, $text);

list ($introtextOld, $fulltextOld) = preg_split($patternOld, $text, 2);
list ($introtext, $fulltext) = preg_split($pattern, $text, 2);

print_r([
    'new' => [
        'tagPos' => $tagPos,
        'intro' => $introtext,
        'more' => $fulltext,
    ],
    'old' => [
        'tagPos' => $tagPosOld,
        'intro' => $introtextOld,
        'more' => $fulltextOld,
    ],
]);