Java 字符串标记

Question

这个问题已经有答案了:

How do I split a string in Java? (38 个回答)

已关闭 7 年前。

我已阅读String.split Javadoc，我还阅读了 How to split a string in Java

我正在尝试这段代码，我的分隔符是

!,?._'@

但是，事实并非如此split 。我的代码有什么问题吗？

import java.io.*;
import java.util.*;

public class Solution {
  public static void main(String[] args) 
  { 
    String[] tokens = "He is a very very good boy, isn't he?".split(" !,\\?\\._'@");
    for (String token : tokens){
      System.out.println(token);
    }
  }
}

输出应该是

He
is
a
very
very
good
boy
isn
t
he

但相反，我得到了

He is a very very good boy, isn't he?

Answer 1

您需要将正则表达式分隔符分成字符类分组(| 符号表示或，而+ 表示一个或更多的)。比如，

String[] tokens = "He is a very very good boy, isn't he?"
        .split("[ |!|,|\\?|\\.|_|'|@|]+");
for (String token : tokens) {
    System.out.println(token);
}

输出(根据要求)

He
is
a
very
very
good
boy
isn
t
he