How I fixed my weird NSRegularExpression issue.

gistfile1.m

BOOL RSHasMarkdownLinks(NSString *x)
{
    NSString *searchText = x;
    NSError *error = NULL;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\[([^\\[]+)\\]\\(([^\\)]+)\\)" options:0 error:&error];
    NSUInteger numberOfMatches = [regex numberOfMatchesInString:searchText options:0 range:NSMakeRange(0, [searchText length])];
    
    return (numberOfMatches > 0);
}

- (NSArray *)rs_links {
	
	if (RSStringIsEmpty(self))
		return nil;
    

  NSString *searchText = self;
  if (RSHasMarkdownLinks(searchText))
  {
      searchText = RSStringReplaceAll(searchText, @"](", @"] (");
  }
    
  NSMutableArray *links = [NSMutableArray array];
	
	/*The regex pattern is from Daring Fireball: <http://daringfireball.net/2010/07/improved_regex_for_matching_urls>
	 It matches things like www.example.com as well as http://example.com/.*/
	
	@autoreleasepool {
		static NSString *pattern = @"(?i)\\b((?:https?://|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:'\".,<>?«»“”‘’]))"; 
        
		NSError *error = nil;
		NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:(NSRegularExpressionOptions)NSMatchingCompleted error:&error];
		if (regex == nil)
			return nil;
		
		NSArray *matches = [regex matchesInString:searchText options:0 range:NSMakeRange(0, [searchText length])];
		for (NSTextCheckingResult *oneResult in matches) {
			NSRange oneRange = [oneResult rangeAtIndex:1];
			NSString *oneLink = [self substringWithRange:oneRange];
			[links rs_safeAddObject:oneLink];
		}
	}
	return links;
}