Question

我的代码是：

String str = str.replaceAll("\\n\\n","\\n");

我要做的是用1个新行替换两个连续的新行。我的代码没有这样做。

人们在关闭问题后编辑：

我正在Windows上运行代码。

我想要做的是替换："This is the first line.\nThis is the second one\nThis is the third one\n\n\This is the fourth one"

使用："This is the first line.\nThis is the second one\nThis is the third one\nThis is the fourth one"

在那里你看到在第三行后我想要一个换行而不是两行换行。

Answer 1

System.out.println(s.replaceAll("\n+","\n")); \\ replace one or more newline characters with just one newline..

示例：

public static void main(String[] args) {
    String s = "abc\n\nabc";
    System.out.println(s);
    System.out.println("hello");
    System.out.println(s.replaceAll("\n+", "\n"));
}

O/P:
abc

abc
hello
abc
abc

Answer 2

String str = str.replaceAll("\n\n","\n");

试试这个

Java Regex用单个新行替换双新行

2 个答案: