NSString *string = @"#Dalton Cherry\n##Dalton Cherry\n*Lorem Ipsum* is simply _dummy_ text of the **printing** and typesetting industry. Lorem Ipsum has been the industry's standard *dummy* text ever since the 1500s. Here is a link to test with [Google](http://www.google.com/), should work fine. Here is a raw link: https://github.com. Hello at @austin, here is that email [email protected]. youtube video: http://www.youtube.com/watch?v=XibDfYd83Zg here is more text. Some more text";

DCTextEngine *engine = [DCTextEngine engineWithMarkdown];
__weak blockEngine = engine;
[engine addPattern:@"more text." found:^DCTextOptions*(NSString *regex, NSString *text){
    DCTextOptions *opts = [DCTextOptions new];
    NSTextAttachment *attach = [[NSTextAttachment alloc] init];
    attach.image = [UIImage imageNamed:@"subways.png"];
    attach.bounds = CGRectMake(0, 0, self.view.frame.size.width, 100);
    opts.attachment = attach;
    return opts;
}];
[engine addPattern:@"(^|\\s)@\\w+" found:^DCTextOptions*(NSString *regex, NSString *text){
    DCTextOptions *opts = [DCTextOptions new];
    opts.color = [UIColor redColor];
    opts.font = [blockEngine boldFont];
    return opts;
}];