java - 无法匹配单词的部分内容

Question

我编写了一个程序来复制第一行，其中包含匹配的单词、单词或单词的一部分。我使用以下代码得到了一个或多个单词的结果。当我输入单词的一部分时，我得到的是空值。

public static void main(String[] args) {

        String paragraph="First time in a long time the cricket team is in Kandy and there is no rain and the skies are blue. Strange days. Hope it stays that way";
        String searchWord="lo";
        Pattern p = Pattern.compile("([A-Z][^.?!]*?)?(?<!\\w)(?i)(" + searchWord + ")(?!\\w)[^.?!]*?[.?!]{1,2}\"?");
        Matcher m = p.matcher(paragraph);
        String sentence = null;
        while (m.find()) {
              sentence = m.group();
              break;
        }
        System.out.println(sentence);
  }

请建议我如何搜索部分单词？

Answer 1

是的，您必须得到一个空匹配作为输出，因为子字符串 lo 后跟字符串 long 中的单词字符 n。因此，将正则表达式中的负向先行 (?!\\w) 更改为正向先行 (?=\\w) 以获得匹配。

Pattern p = Pattern.compile("([A-Z][^.?!]*?)?(?<!\\w)(?i)(" + searchWord + ")(?=\\w)[^.?!]*?[.?!]{1,2}\"?");

DEMO

String paragraph="First time in a long time the cricket team is in Kandy and there is no rain and the skies are blue. Strange days. Hope it stays that way";
String searchWord="lo";
Pattern p = Pattern.compile("([A-Z][^.?!]*?)?(?<!\\w)(?i)(" + searchWord + ")(?=\\w)[^.?!]*?[.?!]{1,2}\"?");
Matcher m = p.matcher(paragraph);
String sentence = null;
while (m.find()) {
      sentence = m.group();
      break;
}
System.out.println(sentence);

输出:

First time in a long time the cricket team is in Kandy and there is no rain and the skies are blue.