Get video URL with regex for current expire time and token-CodePudding

I'm trying to get a current video URL from a page. The video URL has expire time and token in this format: http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0

This is what I got so far:

$html = file_get_contents("http://www.videos.com/");

preg_match_all('/(http.*mp4\?[a-zA-Z] =[0-9] &[a-zA-Z] =([0-9] ([a-zA-Z] [0-9] ) )',

    $html,
    $posts, // will contain the article data
    PREG_SET_ORDER // formats data into an array of posts
);

foreach ($posts as $post) {
    $link = $post[0];

echo $link;
}

With this regex /(http.*mp4(.*?))/ I can get the url until the .mp4

What's missing in my regex to get the full URL? I also tried with this one (but I think something is missing...): /(http.*mp4\?[a-zA-Z] =[0-9] &[a-zA-Z] =([0-9] ([a-zA-Z] [0-9] ) )

CodePudding user response：

In your php example, the regex contains an unclosed parenthesis at the start of the pattern. There are also delimiters missing for the pattern in preg_match_all

Given that the order of the querystring parameters is like this, you can use a capture group for the part after the first equals sign, and a single capture group after the second equals sign:

http\S*?\.mp4\?[a-zA-Z] =([0-9] )&[a-zA-Z] =([0-9a-z] )

See a regex demo.

For example

$html = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";

preg_match_all('/http\S*?\.mp4\?[a-zA-Z] =([0-9] )&[a-zA-Z] =([0-9a-z] )/',
    $html,
    $posts, // will contain the article data
    PREG_SET_ORDER // formats data into an array of posts
);

var_export($posts);

Output

array (
  0 => 
  array (
    0 => 'http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0',
    1 => '1635939248',
    2 => '7022dbc14de970c7uc040ac4f35058f0',
  ),
)

If the order of the parameters is not fixed, you could also use named capture groups with the same name and the J flag.

http\S*?\.mp4\?(?:expire=(?P<expire>[0-9] )&token=(?P<token>[0-9a-z] )|token=(?P<token>[0-9a-z] )&expire=(?P<expire>[0-9] ))

See a php demo.

Note that it might be easier to get the key values pairs using parse_url.

For example

parse_str(parse_url($html, PHP_URL_QUERY), $result);
var_dump($result);

Output

array(2) {
  ["expire"]=>
  string(10) "1635939248"
  ["token"]=>
  string(32) "7022dbc14de970c7uc040ac4f35058f0"
}

CodePudding user response：

You may very well use inbuilt functions instead:

<?php
$url = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";

// parts
$parts = parse_url($url);
print_r($parts);

// query
parse_str($parts["query"], $query);
print_r($query);
?>

This yields

Array
(
    [scheme] => http
    [host] => cdn.videourl.mp4
    [query] => expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0
)
Array
(
    [expire] => 1635939248
    [token] => 7022dbc14de970c7uc040ac4f35058f0
)

See a demo on ideone.com.