How to extract m3u8 of youtube by regex? - php

Question

I had a php file already using regex to extract m3u8 link from youtube, which was working fine until last week.
http://server.com/youtube.php?id=youtbueid
use to pass the youtube id like this.
$string = get_data('https://www.youtube.com/watch?v=' . $channelid);
if(preg_match('#"hlsManifestUrl.":."(.*?m3u8)#', $string, $match)) {
$var1=$match[1];
$var1=str_replace("\/", "/", $var1);
$man = get_data($var1);
//echo $man;
preg_match_all('/(https:\/.*\/95\/.*index.m3u8)/U',$man,$matches, PREG_PATTERN_ORDER);
$var2=$matches[1][0];
header("Content-type: application/vnd.apple.mpegurl");
header("Location: $var2");
}
else {
preg_match_all('#itag.":([^,]+),."url.":."(.*?).".*?qualityLabel.":."(.*?)p."#', $string, $match);
//preg_match_all('#itag.":([^,]+),."url.":."(.*?).".*?bitrate.":.([^,]+),#', $string, $match);
$filter_keys = array_filter($match[3], function($element) {
return $element <= 720;
});
//print_r($filter_keys);
$max_key = array_keys($filter_keys, max($filter_keys))[0];
//print_r($max_key);
$urls = $match[2];
foreach($urls as &$url) {
$url = str_replace('\/', '/', $url);
$url = str_replace('\\\u0026', '&', $url);
}
print_r($urls[$max_key]);
header('location: ' . $urls[$max_key]);
How do I solve this problem?

Answer 1

Based on this post, I'm guessing that the desired URLs might look like:
and we can write a simple expression such as:
(.+\?v=)(.+)
We can also add more boundaries to it, if it was necessary.
RegEx
If this expression wasn't desired, you can modify/change your expressions in regex101.com.
RegEx Circuit
You can also visualize your expressions in jex.im:
PHP Test
$re = '/(.+\?v=)(.+)/m';
$str = ' https://www.youtube.com/watch?v=_Gtc-GtLlTk';
$subst = '$2';
$result = preg_replace($re, $subst, $str);
echo $result;
JavaScript Demo
This snippet shows that we likely have a valid expression:
const regex = /(.+\?v=)(.+)/gm;
const str = ` https://www.youtube.com/watch?v=_Gtc-GtLlTk`;
const subst = `$2`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);