java - 如何编写正则表达式来分割这种格式的字符串？

Question

我想使用[,.!?;~]分割字符串，但我想保留 [,.!?;~]到它的位置例如:

This is the example, but it is not enough

至

[This is the example,, but it is not enough] // length=2
[0]=This is the example,
[1]=but it is not enough

正如您所看到的，逗号仍然在原来的位置。我用这个正则表达式 (?<=([,.!?;~])+) 做到了这一点。 但是 我想在 [,.!?;~] 之后是否出现一些特殊单词(例如:但是) ，然后不要分割字符串的该部分。例如:

I want this sentence to be split into this form, but how to do. So if anyone can help, that will be great

至

[0]=I want this sentence to be split into this form, but how to do.
[1]=So if anyone can help,
[2]=that will be great

正如你所看到的，这部分(形式，但是)没有被分割成第一句话。

Answer 1

我用过:

1. 正向回顾 (?<=a)b保留分隔符。
2. 负前瞻 a(?!b)排除停用词。

请注意我如何附加正则表达式 (?!\\s*(but|and|if))在您提供的正则表达式之后。您可以将所有需要排除的停用词(例如，but、and、if)放在括号内，并用 pipe symbol 分隔。 .

另请注意，分隔符仍然在原来的位置。

输出

Count of tokens = 3
I want this sentence to be split into this form, but how to do.
So if anyone can help,
that will be great

代码

import java.lang.*;

public class HelloWorld {
    public static void main(String[] args) {
        String str = "I want this sentence to be split into this form, but how to do. So if anyone can help, that will be great";
        //String delimiters = "\\s+|,\\s*|\\.\\s*";
        String delimiters = "(?<=,)";

        // analyzing the string 
        String[] tokensVal = str.split("(?<=([,.!?;~])+)(?!\\s*(but|and|if))");

        // prints the number of tokens
        System.out.println("Count of tokens = " + tokensVal.length);

        for (String token: tokensVal) {
            System.out.println(token);
        }
    }
}