“\\”之间有什么区别？和“”在Erlang [英] What is the difference between \" and "" in Erlang

问题描述

在Erlang中， \是一个转义字符，表示双引号。

In Erlang, \" is an escape character that means double quote.

我的问题是， \test \和test之间有什么区别？问是因为，我正在尝试处理一个 list_to_atom 错误：

My question is, what is the difference between "\"test\"" and ""test""? The reason I ask is because, I'm trying to handle a list_to_atom error:

> list_to_atom("\"test\"").
'"test"'
> list_to_atom(""test"").
* 1: syntax error before: test

推荐答案

/ code>是长度为0的字符串/列表

"" is a string/list of length 0

\只是一个转义的双-quote当在字符串的上下文中使用时。如果你想要一个只包含一个双引号（即 \）的字符串，那么你可以这样做：\ 。

\" is just an escaped double-quote when used in the context of a string. If you wanted to have a string that consists of just a double-quote (ie \"), then you could do: "\"".

test是语法错误，没有区别比test在语法上< list>< atom>< list> 。你想完成什么？

""test"" is a syntax error and is no difference than "" test "" which is syntactically <list><atom><list>. What are you trying to accomplish?

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