How to get substring using regular expression?

Question

Java

Hello. I'm trying to process the response string from the VKontakte server. Getting records from the wall. How can you process user mentions in it? The whole entry looks like this: "gewgweg ewwegoih #ihogewig #oihgeirgih [durov|iojfeirjfwe]". From [ to ] mention. What I need to do is to replace the substring from [ to ] with "everything inside after |" (vk.com/everything up to |" (without quotes). How can I do this? Now I'm doing this, the in = in.replaceAll("\\[(.*?)\\]", "упоминание");
mention is replaced. But this is not quite what I need.

Answer 1

https://regex101.com/r/lH8jR8/2
Top - what to look for (1 parameter)
Bottom - what to replace with (2 parameter)