Youtube Video ID From URL - Objective C

Question

I basically have a Youtube url as an NSString, but I need to extract the video id that is displayed in the url. I found many tutorials on how to do this in php or and other

Answer 1

Based on this answer: PHP Regex to get youtube video ID?

I adapted a regex for c/objc/c++ string, the important part here is that the regex doesn't get videos from facebook or other services. iOS regex is based on: ICU

NSString *regexString = @"^(?:http(?:s)?://)?(?:www\\.)?(?:m\\.)?(?:youtu\\.be/|youtube\\.com/(?:(?:watch)?\\?(?:.*&)?v(?:i)?=|(?:embed|v|vi|user)/))([^\?&\"'>]+)";

NSError *error;
NSRegularExpression *regex =
[NSRegularExpression regularExpressionWithPattern:regexString
                                          options:NSRegularExpressionCaseInsensitive
                                            error:&error];
NSTextCheckingResult *match = [regex firstMatchInString:message
                                                options:0
                                                  range:NSMakeRange(0, [message length])];

if (match && match.numberOfRanges == 2) {
    NSRange videoIDRange = [match rangeAtIndex:1];
    NSString *videoID = [message substringWithRange:videoIDRange];

    return videoID;
}

Matches:

• youtube.com/v/vidid
• youtube.com/vi/vidid
• youtube.com/?v=vidid
• youtube.com/?vi=vidid
• youtube.com/watch?v=vidid
• youtube.com/watch?vi=vidid
• youtu.be/vidid
• youtube.com/embed/vidid
• http://youtube.com/v/vidid
• http://www.youtube.com/v/vidid
• https://www.youtube.com/v/vidid
• youtube.com/watch?v=vidid&wtv=wtv
• http://www.youtube.com/watch?dev=inprogress&v=vidid&feature=related
• https://m.youtube.com/watch?v=vidid

Does not match:

• www.facebook.com?wtv=youtube.com/v/vidid
• https://www.facebook.com/video.php?v=10155279523025107