Imgur links come in a lot of different formats:
https://imgur.com/alphanumeric
https://i.imgur.com/alphanumeric.jpg
https://i.imgur.com/alphanumeric.gifv
http://imgur.com/gallery/alphanumeric
https://i.sstatic.net/TQSbJ.jpg (daisy chained together)
imgur.com/a/{alphanumeric}
imgur.com/gallery/{alphanumeric}
imgur.com/g/{alphanumeric}
http://imgur.com/r/SUBREDDIT/IMAGEID
https://i.sstatic.net/PsiCX.jpg
There's probably a lot more too, but I'm not a frequent Imgur user, so I don't know. What I want to do is to take these links and get the image or album ID so I can use it with their API to find whether it's a jpg, gifv, album, etc. I'm using C++, with wstrings, so maybe regex will help here? The links sometimes have http://, sometimes https:// sometimes neither. I'm not too familiar with regex (only used it once before), so I don't know if it would really help here.
OK, I figured it out myself. Not sure why my original question got downvoted so much. Anyway:
wstring str;
wregex filter{ L"[^/]*$" };
std::wsmatch result;
regex_search(str, result, filter);
str = result.str();