Java replaceAll不适用于\ n字符 [英] java replaceAll not working for \n characters

问题描述

我有一个像这样的字符串: John \ n Barber 现在我想用实际的换行符替换\ n，这样它将变成

I have a string like this: John \n Barber now I want to replace \n with actual new line character so it will become

John

理发师

这是我的代码

replaceAll("\\n", "\n");

但是它不能正常工作，并且给我相同的字符串 John \ n Barber

but it is not working and giving me same string John \n Barber

推荐答案

您需要这样做:

replaceAll("\\\\n", "\n");

replaceAll 方法在其第一个参数中需要一个正则表达式.当在Java字符串中传递2 \ 时，您实际上传递了一个.问题在于 \ 也是正则表达式中的转义字符，因此 \ n 的正则表达式实际上是 \\ n ，因此您需要放置一个额外的 \ 两次.

The replaceAll method expects a regex in its first argument. When passing 2 \ in java string you actually pass one. The problem is that \ is an escape char also in regex so the regex for \n is actualy \\n so you need to put an extra \ twice.

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