使用myString.split（" \ n"）时遇到问题; [英] Having problems using myString.split("\n");

问题描述

我需要将输入字符串分成许多部分。拆分应该出现在\ n（字面上反斜杠-n，而不是换行符）。
例如，我想转此：

I need to split an input string into many parts. The splits should occur at "\n" (literally backslash-n, not the newline character). E.g., I want to turn this:

x = [2,0,5,5]\ny = [0,2,4,4]\ndraw y #0000ff\ny = y & x\ndraw y #ff0000

进入：

x = [2,0,5,5]
y = [0,2,4,4]
draw y #0000ff
y = y & x
draw y #ff0000

我原以为 stringArray = string.split（\ n）; 就足够了。

但是它给了我与输入相同的输出下面的代码：

But it gives me the same output as input in the following code:

public static void main(String[] args) throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Enter Input\n");
    String s = br.readLine();
    NewInterpreter interpreter = new NewInterpreter(s);
    interpreter.run();
}

public NewInterpreter(String input) {
    this.input = input;
    this.index = 0;
    this.inputComponents = input.split("\n");
    System.out.println("Output: ");
    for(String s : inputComponents)
        System.out.println(s);
}

Enter Input
x = [2,0,5,5]\ny = [0,2,4,4]\ndraw x #00ff00\ndraw y #0000ff\ny = y & x\ndraw y #ff0000"
Output: 
x = [2,0,5,5]\ny = [0,2,4,4]\ndraw x #00ff00\ndraw y #0000ff\ny = y & x\ndraw y #ff0000

任何帮助都很大谢谢，谢谢！

Any help is greatly appreciated, thanks!

推荐答案

如果您输入 \ n 字面上（即与换行符相对），您需要按如下方式拆分：

If you're entering \n literally (i.e. as opposed to as a newline character), you need to split as follows:

string.split("\\\\n");

复杂的原因是 split（）将正则表达式作为参数。当尝试使用正则表达式匹配文字反斜杠时，需要对其进行双重转义（一次用于正则表达式，一次用于字符串）文字）。

The reason for the complexity is that split() takes a regular expression as an argument. When trying to match a literal backslash using a regular expression, it needs to be doubly escaped (once for the regular expression, and once for the string literal).

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