如何从Java中的String中检测重复的单词？ [英] How to detect duplicate words from a String in Java?

问题描述

可以检测到String中的重复单词的方式是什么？

例如这是一个重复测试的测试消息包含一个重复的单词测试。

这里的目标是检测字符串中出现的所有重复单词。 >

使用正则表达式更适合实现目标。

解决方案

以下Java代码解决了从String中检测重复的问题。如果重复的单词用换行符或标点符号分隔，则不应该有任何问题。

  String duplicatePattern =（？i） \\b（\\w +）\\b [\\w\\W] * \\b\\1\\b; 
模式p = Pattern.compile（duplicatePattern）; 
字符串短语=这是＃$;％@;<>？\\` p是一个重复测试的Test \; 
 Matcher m = p.matcher（phrase）; 
 String val = null; 
 while（m.find（））{
 val = m.group（）; 
 System.out.println（Matching segment is \+ val +\）; 
 System.out.println（重复单词：+ m.group（1）+\\\
）; 
} 
  

代码的输出将是：

 匹配段是是＃$;％@;<>？| \` p是一个是
重复单词：
 
匹配段是Test 
的重复测试
重复单词：Test 
  

这里，m.group（1）语句表示与第一组模式匹配的字符串[这里，它是（\\\w +）]。

What are the ways by which duplicate word in a String can be detected?

e.g. "this is a test message for duplicate test" contains one duplicate word test.

Here, the objective is to detect all duplicate words which occur in a String.

Use of regular expression is preferable to achieve the goal.

解决方案

The following Java code resolves the problem of detecting duplicates from a String. There should not be any problem if the duplicate word is separated by newline or punctuation symbols.

    String duplicatePattern = "(?i)\\b(\\w+)\\b[\\w\\W]*\\b\\1\\b";
    Pattern p = Pattern.compile(duplicatePattern);
    String phrase = "this is#$;%@;<>?|\\` p is a is Test\n of duplicate test";
    Matcher m = p.matcher(phrase);
    String val = null;
    while (m.find()) {
        val = m.group();
        System.out.println("Matching segment is \"" + val + "\"");
        System.out.println("Duplicate word: " + m.group(1)+ "\n");
    }

The output of the code will be:

Matching segment is "is#$;%@;<>?|\` p is a is"
Duplicate word: is

Matching segment is "Test
 of duplicate test"
Duplicate word: Test

Here, m.group(1) statement represents the String matched against 1st group of Pattern [here, it's (\\w+)].

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