Java matcher how to dynamically replace groups based on their value

For a quick sample, I have the following string:

String s = "hey.there.man.${a.a}crazy$carl${a.b}jones

I also have the following method:

private String resolveMatchedValue(String s) {
    if(s.equals("a.a")) {
           return "A";
    else if(s.equals("a.b")) { 
           return "Wallet";
    else if(.....
    ....
 }

My pattern would be

 Pattern pattern = Pattern.compile("\\$\\{(.*?)\\}");

So for every substring in s that matches ${.*} I want there to be a call to the resolveMatchedValue method and it should be replaced with that. So ideally after the regex process s should be

 s = "hey.there.man.Acrazy$carl$Walletjones

I've looked at similar solutions but nothing that dynamically replaces the matched values based on the matched value, and have not been able to get it to work