在JavaScript中将多个\ n替换为1 [英] Replace multiple \n with 1 in JavaScript

问题描述

如何只用一个替换多个 \ n ？因此，如果用户输入

How do I replace multiple \n's with just one? So if a user enters

blah 

blahdy blah



blah blah

我希望它最终看起来像。

I want it to end up looking like.

blah
blahdy blah
blah blah

我知道我可以使用while（）循环，但宁愿使用正则表达式，因为我认为它更有效。

I know I could loop through with a while() but would rather use a regular expression, since I believe it's more efficient.

推荐答案

这对我有用：

string = string.replace(/\n+/g, '\n');

正如其他人所说的那样，它取代了连续一次或更多的每次出现换行符（ \ n + ）只有一个。

As others have said, it replaces each occurrence of one or more consecutive newline characters (\n+) with just one.

g 影响全局替换，意味着它替换字符串中的所有匹配而不是第一个匹配。

The g effects a "global" replace, meaning it replaces all matches in the string rather than just the first one.

编辑：如果您还想考虑其他操作系统的行结束样式（例如， \\\ ），您可以执行多步替换：

Edit: If you want to take into account other operating systems' line ending styles as well (e.g., \r\n), you could do a multi-step replace:

string = string.replace(/(\r\n)+/g, '\r\n') // for Windows
    .replace(/\r+/g, '\r')                  // for Mac OS 9 and prior
    .replace(/\n+/g, '\n');                 // for everything else

OR （感谢Renesis ：

string = string.replace(/(\r\n|\r|\n)+/g, '$1');

如果你事先知道你正在处理什么样的文本，上面的内容可能有点过头了它带来了明显的性能成本。

If you know in advance what sort of text you're dealing with, the above is probably overkill as it carries am obvious performance cost.

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