Regular Expression (preg_match_all) - php

Question

I have a private website where I share videos (and some other stuff).
What I have achieved is that with preg_match_all() it automatically finds the link and it paste the video with the HTML code to my website.
Here an example:
<?php
$matchwith = "http://videosite.com/id1 http://videosite.com/id2 http://videosite.com/id3";
preg_match_all('/videosite\.com\/(\w+)/i', $matchwith, $matches);
foreach($matches[1] as $value)
{
print 'Hyperlink';
}
?>
This works. I know this could may could be done easier, but it has to be this way.
But I do not know how this with a two part movie. Here an example:
$matchWith = "http://videosite.com/id1_movie1 http://videosite.com/id2_movie1"
"http://videosite.com/id3_movie2 http://videosite.com/id4_movie2";
Everything after http://videosite.com/(...) is unique.
What I want is if you write Part 1 and Part 2 (or whatever) before the link, that it automatically detects it as Part 1 and Part 2 of this video.
$matchwith could contain different movies.

Answer 1

So I believe this is what you need:
<?php
$matchWith = "Movie 1 http://videosite.com/id1" . PHP_EOL .
"Movie 1 http://videosite.com/id2" . PHP_EOL .
"Movie 2 http://videosite.com/id3";
$arrLinks = array();
preg_match_all('%(.*)\shttp://videosite\.com/(\w+)\r{0,1}%', $matchWith, $result, PREG_SET_ORDER);
for ($matchi = 0; $matchi < count($result); $matchi++) {
$arrLinks[$result[$matchi][1]][] = $result[$matchi][2];
}
foreach ($arrLinks as $movieName => $arrMovieIds) {
print '<div>' . $movieName . '</div>';
foreach ($arrMovieIds as $movieId) {
print 'Hyperlink<br/>';
}
}
?>

Answer 2

$matchwith = "Part 1 http://videosite.com/id1-1 Part2 http://videosite.com/id1-2";
preg_match_all('/videosite\.com\/(\w+-\d+)/i', $matchwith, $matches);
foreach($matches[1] as $value)
{
print 'Hyperlink';
}