如何在java中用问号、点和感叹号分割字符串

Question

如何使用分隔符作为问号、点和感叹号将其拆分为 String 数组。 然后在每个大写字符之前放一个空格。 之后使该字符小写。

String one = "ATrueRebelYouAre!EveryoneWasImpressed.You'llDoWellToContinueInTheSameSpirit?";

Answer 1

要使用多个分隔符进行拆分，您可以使用正则表达式 OR 运算符：

String[] tokens = one.split("\\?|\\.|\\!");

要在每个大写字母之前放置一个空格，您可以执行以下操作：

String two = "";
for (int i = 0; i < tokens.length; i++) {
    String phrase = tokens[i];
    String outputString = "";
    for (int k = 0; k < phrase.length(); k++) {
        char c = phrase.charAt(k);
        outputString += Character.isUpperCase(c) ? " " + c : c;
    }
two += outputString + " ";
}
two = two.replaceAll("\\s+", " ");

这将打印以下内容：

A True Rebel You Are Everyone Was Impressed You'll Do Well To Continue In The Same Spirit

但是你也可以做这样的事情：

String two = "";
for (int k = 0; k < one.length(); k++) {
    char c = one.charAt(k);
    two += Character.isUpperCase(c) ? " " + c : c;
}
two = two.replaceAll("\\s+", " ");
System.out.println(two);

这将打印：

A True Rebel You Are! Everyone Was Impressed. You'll Do Well To Continue In The Same Spirit?

Answer 2

使用零宽度断言。 其中 ?= 是正向预测，而 ?<= 是负向预测。 我们可以在流中使用它，如下所示：

    List<String> collect = Arrays.stream(one.split("(?<=[?.!])"))
    .map(sentence -> sentence.replaceAll("(?=[A-Z])", " ").trim() )
    .collect(Collectors.toList());

结果如下：

[A True Rebel You Are!, Everyone Was Impressed., You'll Do Well To Continue In The Same Spirit?]

Answer 3

做到了！

    String one = "ATrueRebelYouAre!EveryoneWasImpressed.You'llDoWellToContinueInTheSameSpirit?";

    String oneWithSpaces = one.replace("!","! ").replace("?","? ").replace(".",". ");
    String[] splitedWithDelimeters = oneWithSpaces.split(" ");


    for (int j = 0; j < splitedWithDelimeters.length; j++) {

        String[] str = splitedWithDelimeters[j].split("(?=[A-Z])");



        for (int i = 0; i < str.length; i++) {
            if (i == 0) {
                System.out.print(str[i] + " ");
            } else if (i > 0) {
                System.out.print(str[i].toLowerCase() + " ");
            }
        }
    }