reverse engineered the perchance chatbot

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Random;

public class Joker {
    /*
    * extend me and add sentences and lists for parameters in the sentences in the
    * sub classes c'tor. see JokerIncel class for exammple see Joker Util class for
    * editing a large amount of data faster B4 adding it in the subclasses c'tor
    */
    protected ArrayList<String> sentences = new ArrayList<String>();
    protected Hashtable<String, ArrayList<String>> wordToList = new Hashtable<>();
    protected Random rand = new Random();
    private RegexUtil regexUtil = new RegexUtil();
    public Joker() {
        super();
    }

    public String generateJoke() {
        int x = rand.nextInt(sentences.size());
        String result = sentences.get(x);
        return clearRecursion(result);
    }

    private String clearRecursion(String result) {
        int x;
        ArrayList<String> params = new ArrayList<String>();
        params = regexUtil.regexChecker2("(\\w+)(?= #)", result);
        for (String strI : params) {
            ArrayList<String> temp = wordToList.get(strI);
            int n = temp.size();
            x = rand.nextInt(n);
            String s1 = temp.get(x);
            result = result.replace(strI + " #", s1);
        }
        if (!result.contains("#")) {
            return result;
        } else {
            return clearRecursion(result);
        }
        // return "";
    }
}