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

- (NSString*)getYoutubeVideoID:(NSString*)url {
    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?<=watch\\?v=|/videos/|embed\\/)[^#\\&\\?]*"
                                              options:NSRegularExpressionCaseInsensitive
                                                error:&error];

    NSTextCheckingResult *match = [regex firstMatchInString:url
                                                    options:0
                                                      range:NSMakeRange(0, [url length])];
    NSString *substringForFirstMatch;
    if (match) {
        NSRange videoIDRange = [match rangeAtIndex:0];
        substringForFirstMatch = [url substringWithRange:videoIDRange];
    }
    return substringForFirstMatch;
}