/**
     * . 匹配所有字符，除换行服\n
     * 如果要匹配"\n"在内的所有字符，一般用[\s\S]
     */
    public static String noLineFeed(){
        String regular = ".";
        String number = "w";
        return patternTool(regular,number);
    }

public static String patternTool(String regular,String str){

        Pattern pattern = Pattern.compile(regular);
        Matcher matcher = pattern.matcher(str);
        if (matcher.find()){
            return matcher.group();
        }
        return "不匹配";
    }