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

Here is my solution which referenced from StackOveFlow. (Youtube I.D parsing for new URL formats)

I did some modification.

///This is the .h

#import 
@interface YoutubeParser : NSObject

+(BOOL) isValidateYoutubeURL:(NSString * )youtubeURL;

+(NSArray *) parseHTML:(NSString *)html ;

@end

///This is the .m 
#import "YoutubeParser.h"

@interface YoutubeParser () {
}

@end

@implementation YoutubeParser

#define YOUTUBE_PATTERN @"(https?://)?(www\\.)?(youtu\\.be/|youtube\\.com)?(/|/embed/|/v/|/watch\\?v=|/watch\\?.+&v=)([\\w_-]{11})(&.+)?"

+(NSRegularExpression *)regex {

    static NSRegularExpression * regex = nil;

    regex =     [NSRegularExpression regularExpressionWithPattern:YOUTUBE_PATTERN
                                                               options:NSRegularExpressionCaseInsensitive
                                                                 error:nil];
    return regex;
}

+(BOOL) isValidateYoutubeURL:(NSString * )youtubeURL {
    NSInteger cnt = [[YoutubeParser regex] numberOfMatchesInString:youtubeURL options:0 range:NSMakeRange(0, [youtubeURL length])  ];

    return cnt > 0 ? YES : NO;
}

typedef void (^matching_block_t)  (NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop);

+(NSArray *) parseHTML:(NSString *)html {
    NSMutableArray * youtubeURLArray = [[NSMutableArray alloc] init];

    matching_block_t parseTask = ^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
        NSRange matchRange = [result range];
        NSRange youtubeKey = [result rangeAtIndex:5]; //the youtube key
        NSString * strKey = [html substringWithRange:youtubeKey] ;
        NSLog(@"youtubeKey=%@ , with url=%@ " ,strKey , [html substringWithRange:matchRange]);

        [youtubeURLArray addObject:strKey];
    };

    [[YoutubeParser regex] enumerateMatchesInString:html   options:0   range:NSMakeRange(0, [html length])   usingBlock:parseTask ];

    return youtubeURLArray;
}

@end