Extract links from string optimization

Question

I get data (HTML string) from website. I want to extract all links. I write function (it works), but it is so slow...

Can you help me to optimize it? What standard

Answer 1

I wonder if you realise that every single time that you call countElements, a major complex function is called that has to scan all the Unicode characters in your string, and extract extended grapheme clusters from them and count them. If you don't know what an extended grapheme cluster is then you should be able to imagine that this isn't cheap and major overkill.

Just convert it to an NSString*, call rangeOfString and be done with it.

Obviously what you do is totally unsafe, because http:// doesn't mean there is a link. You can't just look for strings in html and hope it works; it doesn't. And then there is https, Http, hTtp, htTp, httP and so on and so on and so on. But that's all easy, for the real horror follow the link in Uttam Sinha's comment.