如何从Java输入文本中删除标点符号？ [英] How can I remove punctuation from input text in Java?

问题描述

我试图用Java中的用户输入来获得一个句子，并且我需要将它变成小写字母并删除所有的标点符号。这是我的代码：

  String [] words = instring.split（\\s +）; 
 for（int i = 0; i  words [i] = words [i] .toLowerCase（）; 
} 
 String [] wordsout = new String [50]; 
 Arrays.fill（wordsout，）; 
 int e = 0; 
 for（int i = 0; i  if（words [i]！=）{
 wordsout [e] = words [e] ; 
 wordsout [e] = wordsout [e] .replaceAll（，）; 
 e ++; 
} 
} 
 return wordsout; 
  

我似乎找不到任何方法来删除所有非字母字符。我曾尝试使用正则表达式和迭代器没有运气。感谢您的帮助。

解决方案

这首先删除所有非字母字符，折叠为小写，然后拆分输入，
$ b

  String [] words = instring.replaceAll（[^ a-zA-Z] ，）.toLowerCase（）。split（\\s +）; 
  

空格最初留在输入中，所以分割仍然有效。 b

通过在分割之前删除垃圾字符，可避免必须遍历元素。

I am trying to get a sentence using input from the user in Java, and i need to make it lowercase and remove all punctuation. Here is my code:

    String[] words = instring.split("\\s+");
    for (int i = 0; i < words.length; i++) {
        words[i] = words[i].toLowerCase();
    }
    String[] wordsout = new String[50];
    Arrays.fill(wordsout,"");
    int e = 0;
    for (int i = 0; i < words.length; i++) {
        if (words[i] != "") {
            wordsout[e] = words[e];
            wordsout[e] = wordsout[e].replaceAll(" ", "");
            e++;
        }
    }
    return wordsout;

I cant seem to find any way to remove all non-letter characters. I have tried using regexes and iterators with no luck. Thanks for any help.

解决方案

This first removes all non-letter characters, folds to lowercase, then splits the input, doing all the work in a single line:

String[] words = instring.replaceAll("[^a-zA-Z ]", "").toLowerCase().split("\\s+");

Spaces are initially left in the input so the split will still work.

By removing the rubbish characters before splitting, you avoid having to loop through the elements.

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