reverseInParentheses

String reverseInParentheses(String inputString) {

    if(inputString.isEmpty() || inputString.equals("()")) return "";

    StringBuilder temp = new StringBuilder();
    Pattern pattern = Pattern.compile("[(]([\\w]+)[)]");
    Matcher matcher = pattern.matcher(inputString);

    while(inputString.contains("(") && inputString.contains(")")){
        if(matcher.find()){
            temp = new StringBuilder(matcher.group(1));
            temp.reverse();
            inputString = inputString.replace(matcher.group(0), temp);
            matcher = pattern.matcher(inputString);
        } else {
            return inputString;
        }
    }
    return inputString;
}