匹配正则：(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})
替换语句：$1-$2-$3 $4:$5:$6
java测试代码示例：
public class Demo {
public static void main(String[] args) {
String time = "20180823103000";
String newTime = time.replaceAll("(\\d{4})(\\d{2})(\\d{2})(\\d{2})(\\d{2})(\\d{2})", "$1-$2-$3 $4:$5:$6");
System.out.println(newTime);
}
}
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