如何检查preg_match的复杂文本？

Question

I've already seen some posts about it, but my text is a bit complicated,

And I can not get it to work.

Part of my page:

otherurl":"http:\/\/cdn1-test.peer5.net:80\/edge\/71-1.stream\/playlist.m3u8?uid=35577\u0026sil=3\u0026sip=WyIxODUuMTgueC54IiwiMjEwLj4LngiLCI54LngLjE1OC5giXQ%3D%3D\u0026sid=151078248\u0026misc=4OFxyLUs7UrIeWujPzuU%3D"}}

What I tried:

preg_match("/otherurl":"http:\/\/cdn1-test.peer5.net:80\/edge\/71-1.stream\/playlist.m3u8?uid=(.*)/", $data[$n], $output);
echo $output[1];

What I want to present:

Just the number after uid=*

Answer 1

If the string you receive is reliably formatted like your posted examples, where the uid= parameter is the first query parameter after ? and is strictly a numeric string, you can use preg_match() to extract it by matching with (\d+) (match digits) because whatever follows in the next query parameter won't begin with a digit.

$str = 'otherurl":"http:\/\/cdn1-test.peer5.net:80\/edge\/71-1.stream\/playlist.m3u8?uid=35577\u0026sil=3\u0026sip=WyIxODUuMTgueC54IiwiMjEwLj4LngiLCI54LngLjE1OC5giXQ%3D%3D\u0026sid=151078248\u0026misc=4OFxyLUs7UrIeWujPzuU%3D"}}';

preg_match('/\?uid=(\d+)/', $str, $output);
echo $output[1];
// Prints "35577"

In practice I would avoid this though. The best way to handle this is to treat it as the JSON stream it is, in combination with PHP's built-in URL handling methods parse_url() and parse_str().

That solution looks like:

// Note: I made this segment a valid JSON string...
$input_json = '{"otherurl":"http:\/\/cdn1-test.peer5.net:80\/edge\/71-1.stream\/playlist.m3u8?uid=35577\u0026sil=3\u0026sip=WyIxODUuMTgueC54IiwiMjEwLj4LngiLCI54LngLjE1OC5giXQ%3D%3D\u0026sid=151078248\u0026misc=4OFxyLUs7UrIeWujPzuU%3D"}';

$decoded = json_decode($input_json, TRUE);
// Parse the URL and extract its query string
// PHP_URL_QUERY instructs it to get only the query string
// but if you ever need other segments that can be removed
$query = parse_url($decoded['otherurl'], PHP_URL_QUERY);
// Parse out the query string into array $parsed_params
$params = parse_str($query, $parsed_params);
// Get your uid.
echo $parsed_params['uid'];
// Prints 35577