How to Reliably Extract YouTube Video IDs Using Regular Expressions?

Parse YouTube Video ID Using preg_match

Attempting to derive the video ID from a YouTube URL using preg_match, an issue arises where the pattern provided leads to an "Unknown modifier '[' error." To address this, an alternative regular expression is offered that effectively captures video IDs across various URL formats.

The improved regular expression is as follows:

if (preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/\s]{11})%i', $url, $match)) {
    $video_id = $match[1];
}

This pattern successfully matches the following URL formats:

• Complete URL: http://www.youtube.com/watch?v=dQw4w9WgXcQ
• Embed URL: http://www.youtube.com/embed/dQw4w9WgXcQ
• Short URL: http://youtu.be/dQw4w9WgXcQ
• Search URL: http://www.youtube.com/?v=dQw4w9WgXcQ
• User URL: http://www.youtube.com/user/username#p/u/11/dQw4w9WgXcQ
• Channel URL: http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/0/dQw4w9WgXcQ
• Embedded URL (iframe): http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcQ
• Embedded URL (object): http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcQ

Utilizing this regex, the video ID can be reliably extracted from a variety of YouTube URLs.

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