How can I use the $+ or $& regular expressions in Java?

Question

I've been searching for a while trying to figure out why this wont work- I found the exact thing I want to accomplish Simple regex replace to keep original string but I can't seem to use the regular expression $+ or $& in Java like so:

String S1 = "bob";
String S2 = "the builder";
Pattern p = Pattern.compile(S1, Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(ST);
ST = m.replaceAll("$+/"+S2);

Answer 1

使用$0来表示替换模式中的整个匹配项。