String.replace具有双反斜杠的所有单个反斜杠 [英] String.replaceAll single backslashes with double backslashes

问题描述

我正在尝试将 String \something\ 转换为字符串 \\something\\ 使用 replaceAll ，但我不断得到各种错误。我以为这是解决方案：

I'm trying to convert the String \something\ into the String \\something\\ using replaceAll, but I keep getting all kinds of errors. I thought this was the solution:

theString.replaceAll("\\", "\\\\");

但这给出了以下异常：

java.util.regex.PatternSyntaxException: Unexpected internal error near index 1

推荐答案

String＃replaceAll（） 将参数解释为，//docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#sumrel =noreferrer>。 c $ c> \ 是 String 和正则表达式。您需要双重转义为正则表达式：

The String#replaceAll() interprets the argument as a regular expression. The \ is an escape character in both String and regex. You need to double-escape it for regex:

string.replaceAll("\\\\", "\\\\\\\\");

但是，您不一定需要正则表达式，只因为您需要一个确切的字符，字符替换，你不需要这里的模式。所以 String＃replace（） 应该足够了：

But you don't necessarily need regex for this, simply because you want an exact character-by-character replacement and you don't need patterns here. So String#replace() should suffice:

string.replace("\\", "\\\\");

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更新：as根据注释，您似乎希望在JavaScript上下文中使用该字符串。你可能会更好地使用 StringEscapeUtils＃escapeEcmaScript（） ，以覆盖更多字符。

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Update: as per the comments, you appear to want to use the string in JavaScript context. You'd perhaps better use StringEscapeUtils#escapeEcmaScript() instead to cover more characters.

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