字符串中数字和汉字之前打空格

    public static void main(String[] args) {
        String regex = "(?<=[\u4e00-\u9fa5A-Za-z])(?=[0-9])|(?<=[0-9])(?=[\u4e00-\u9fa5A-Za-z])";

        String input = "大床1.8米";

        String result = input.replaceAll( regex, " " );

        System.out.println(result);
    }

大床 1.8 米