问题描述
我正在尝试使用 Java 中的用户输入来获取一个句子，我需要将其设为小写并删除所有标点符号.这是我的代码:
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;
我似乎找不到任何方法来删除所有非字母字符.我尝试过使用正则表达式和迭代器，但没有成功.感谢您的帮助.
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.
推荐答案
这首先删除所有非字母字符，折叠为小写，然后拆分输入，在一行中完成所有工作:
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+");
空格最初留在输入中，因此拆分仍然有效.
Spaces are initially left in the input so the split will still work.
通过在拆分之前删除垃圾字符，您可以避免遍历元素.
By removing the rubbish characters before splitting, you avoid having to loop through the elements.
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