java - 将字符串拆分为 3 个单词的部分 Java

Question

我想在 Java 中将一个字符串拆分为 3 个单词的一部分。

例如:

I want to walk in the park with my father

我想要一个字符串:"I want to"，还有一个字符串:"walk in the"，等等

我该怎么做？

Answer 1

这是一个使用 RegEx 的解决方案

String sentence = "I want to walk in the park with my father";

Pattern pattern = Pattern.compile("\\w+ \\w+ \\w+ ");
Matcher matcher = pattern.matcher(sentence);
while (matcher.find()) {
    System.out.println(matcher.group());
}

请注意，此表达式的最后一个词“父亲”不匹配。

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对于非正则表达式的解决方案，我会使用这样的东西

String sentence = "I want to walk in the park with my father";

String[] words = sentence.split(" ");
List<String> threeWords = new ArrayList<>();

int length = words.length;
for (int ind = 2; ind < length; ind += 3) {
    threeWords.add(words[ind - 2] + " " + words[ind - 1] + " " + words[ind]);
}

if (length % 3 == 1) {
    threeWords.add(words[length - 1]);
} else if (length % 3 == 2) {
    threeWords.add(words[length - 2] + " " + words[length - 1]);
}