final StringBuilder buf = new StringBuilder(100);
            while (attrMatcher.find()) {
                buf.append(attrMatcher.group(1)).append(' ');
            }
            matcher.appendReplacement(sb, buf.toString().replace("\\", "\\\\").replace("$", "\\$"));
        }
        matcher.appendTail(sb);
        return sb.toString().replaceAll("\\s+", " ").trim();
    }

    /**