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

Merging some of your answers, I'd say this is the best answer:

+ (NSString *)extractYoutubeID:(NSString *)youtubeURL
{
    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?<=v(=|/))([-a-zA-Z0-9_]+)|(?<=youtu.be/)([-a-zA-Z0-9_]+)"
                                                                           options:NSRegularExpressionCaseInsensitive
                                                                             error:&error];
    NSRange rangeOfFirstMatch = [regex rangeOfFirstMatchInString:youtubeURL options:NSMatchingReportProgress range:NSMakeRange(0, [youtubeURL length])];
    if(rangeOfFirstMatch.location != NSNotFound) {
        NSString *substringForFirstMatch = [youtubeURL substringWithRange:rangeOfFirstMatch];

        return substringForFirstMatch;
    }

    return nil;
}