private String executeScripts(String script) {
		Matcher m = SCRIPT_PATTERN.matcher(script);
		int start = 0, end = 0;
		String match = "", group = "";
		while (m.find()) {
			group = script.substring(start, end).trim().toLowerCase();
			start = m.start();
			match = script.substring(end, start);
			end = m.end();
			executeScripts(group, match);
		}
		group = script.substring(start, end);
		match = script.substring(end, script.length());
		executeScripts(group, match);
		return null;
	}