在双引号内转义双引号 [英] Escape double quotes within double quotes

问题描述

我有一个字符串[{"Id":"1","msg":""Lorem Ipsum""}]，在其中我只需要对引号内的引号进行转义，例如[{"Id":"1","msg":"\"Lorem Ipsum\""}].我无权修改生成器代码，因此我正在寻找正则表达式解决方案或高效的Java解决方案.

I have a string [{"Id":"1","msg":""Lorem Ipsum""}] in which I need to just escape the quotes inside the quotes like this [{"Id":"1","msg":"\"Lorem Ipsum\""}]. I don't have access to generator code to modify, so I'm looking for a regex solution or efficient Java solution.

我尝试用\"[^\"]*?(\"*)[^\"]*?\"选择匹配项，这没有用.任何帮助，我们真的很感激.预先感谢.

I tried selecting matches with \"[^\"]*?(\"*)[^\"]*?\" which is of no use. Any help is really appreciated. Thanks in advance.

请注意，不能保证模式始终都是两个双引号，"Lorem "Ipsum" test"也可能是这样，应该变成"Lorem \"Ipsum\" test".

Note that it isn't guaranteed that the pattern is always two double quotes together, it can be something like this too "Lorem "Ipsum" test", which should become "Lorem \"Ipsum\" test".

PS:我已经看过将正则表达式在双引号内转义双引号

推荐答案

问题

有限自动机-正则表达式的理论等效项-无法解析递归结构.由于您可以使用内部引号，也可以使用内部-内部引号，因此使用正则表达式无法解决您的问题.

The problem

A finite automaton - the theoretical equivalent of a regex - can't parse recursive structures. Since you can have inner quotes, and possible inner-inner quotes, your problem can't be solved using a regex.

尽管现代的正则表达式引擎可以通过几个扩展来解决此问题，但不要浪费时间寻找引号内的引号.您很快就会发现，您实际上是在构建一个完整的JSON解析器.

Although modern regex engines can overcome this problem with several extensions, don't waste your time on hunting quotes-within-quotes. You'll soon find out that you're actually building a full blown JSON parser.

如 @ johnchen902所述，即使是图灵机驱动的解析器也无法处理歧义-因此，最好不要尝试建议修复损坏的JSON.

As @johnchen902 stated, even a turing-machine powered parser can not handle ambiguities - so you better not try to suggest a fix to the broken JSON.

给定的字符串不是有效的JSON .它可能是使用字符串连接创建的，这通常是一个坏主意，因为它不能正确地转义.您应该使用可以从Java数据结构构建JSON的JSON库，例如 gson .创建一个对象列表，向其中添加一个对象到对象"字典，然后让该库进行转义和转换.

The given string is not a valid JSON. It's probably created using string concatenation, which is generally a bad idea because it does not escape correctly. You should use a JSON library that can build JSON from a Java data structure, like gson. Create a list of Objects, add an Object-to-Object dictionary to it, and let the library do the escaping and conversions.

如果您是从外部来源收到的String，则索取可以使用的 valid json是完全合法的.我想创建者将字符串缝合在一起，这是构建结构化语言的错误方法.要求原始创建者使用标准库来创建JSON，或者至少使用验证器.所有现代编程语言都提供了这些机制.

If you have received the String from an external source, it's perfectly legitimate to ask for a valid json you can work with. I guess that the creator stitched Strings together, which is the wrong way to build a structured language. Ask the original creator to use a standard library for creating JSONs, or at least use a validator. All modern programming languages offer these mechanisms.

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