What do these special characters mean in Java?

Question

I was looking at some of the jdk code. I found these characters. Could someone explain to me what do these mean.

public static String quote(String s) {
    i         


        

Answer 1

Well, \Q and \E have a special meaning in Java regular expressions...

Most of this method is just working on the tricky edge case of quoting the quote markers \Q and \E themselves.