Question

我有一个包含空格的字符串，我希望用"\_"替换该空格。例如，这是我的代码

String example = "Bill Gates";
example = example.replaceAll(" ","\\_");

例子的结果是：＆＃34; Bill_Gates＆＃34;不是＆＃34;比尔\ _盖茨＆＃34;。当我尝试这样做时

String example = "Bill Gates";
example = example.replaceAll(" ","\\\\_");

例子的结果是：＆＃34;比尔\\ _盖茨＆＃34;不是＆＃34;比尔\ _盖茨＆＃34;

Answer 1

您需要使用replaceAll(" ","\\\\_")代替replaceAll(" ","\\_")。因为'\\'是文字。它将被编译为'\'单斜杠。将此传递给replaceall方法时。它将第一个斜杠作为“_”的转义字符。如果您查看replaceall方法

    while (cursor < replacement.length()) {
        char nextChar = replacement.charAt(cursor);
        if (nextChar == '\\') {
            cursor++;
            if (cursor == replacement.length())
                throw new IllegalArgumentException(
                    "character to be escaped is missing");
            nextChar = replacement.charAt(cursor);
            result.append(nextChar);
            cursor++;

当找到一个斜杠时，它将替换该斜杠的下一个字符。所以你必须输入“\\\\ _”来替换方法。然后它将被处理为“\\ _”。方法将首先看斜杠并替换第二个斜杠。然后它将取代下划线。

Answer 2

尝试：

String example = "Bill Gates";
example = example.replaceAll(" ","\\\\_");   
System.out.println(example);

Answer 3

public static void main(String[] args) {
        String example = "Bill Gates";
        example = example.replaceAll(" ", "\\\\_");
        System.out.println(example);
    }

<强>输出

Bill\_Gates

如何用＆＃34; \ _＆＃34;完全替换空格在java String中？

3 个答案: