String val = (String) value;

            int exprStartDelimiter = val.indexOf("${");

            if (exprStartDelimiter >= 0) {
                if (exprStartDelimiter > 0) {
                    value = val.substring(0, exprStartDelimiter) + evaluate(val.substring(exprStartDelimiter));
                } else {
                    value = evaluate(val.substring(exprStartDelimiter));
                }