java - 如何从字符串中获取特定的摘录？

Question

我想从字符串中获取摘录。摘录应包含关键字前面的 2 个单词和关键字后面的 2 个单词。如果这两个词不存在，则句子应该结束。

示例:

我要找的词是“example”。

现有字符串:

String text1 = "This is an example.";
String text2 = "This is another example, but this time the sentence is longer";

结果:

text1 应如下所示:

is an example.

text2 应如下所示:

is another example, but this

我该怎么做？

Answer 1

尝试使用模式:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test {

    public static void main(String[] args) {
        String text1 = "This is an example.";
        String text2 = "This is another example, but this time the sentence is longer";
        String key = "example";
        String regex = "((\\w+\\s){2})?" + key +"([,](\\s\\w+){0,2})?";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(text1);
        matcher.find();
        System.out.println(matcher.group(0));
        matcher = pattern.matcher(text2);
        matcher.find();
        System.out.println(matcher.group(0));
    }
}

输出:

is an example

is another example, but this

也许您需要稍微更改一下正则表达式，但您可以尝试使用这个。