Ruby 字符串前加 '\' 字符 [英] Ruby string prepend '\' character

问题描述

当我尝试在代码下方运行时，为什么 ruby​​ 在前面加上 '\' 字符.它只发生在 '#$'

why ruby is prepends '\' character while I am trying to run below code. It is happening with only '#$'

所有 ruby​​ 版本都会发生这种情况.

It is happening with all ruby version.

puts '#$'   => '\#$'

或

'#$'  => '\#$'

或

'mypassord#$123'  =>  'mypassord\#$123'

请在这里分享您的经验.是红宝石问题还是什么?

Please share you experience here. Is it a ruby problem or anything?

推荐答案

不，这不是 ruby​​ 问题.这是你的问题.由于#$foo 可以解释为全局变量$foo 的插值，因此需要对# 字符进行转义.这就是为什么有一个反斜杠.

No it is not a ruby problem. It is your problem. Since #$foo can be interpreted as interpolation of the global variable $foo, it is necessary to escape the # character. That is why there is a backslash.

更准确地说，不可能用字符串 "#$" ($ 是一个无效的全局变量) 或 "#$123 进行插值" ($123 是一个无效的全局变量)，但它使检查算法或插值算法变得复杂，以检查 #$ 之后的序列，所以我猜这就是为什么即使在这种情况下 # 也会被转义.

To be more precise, there is no possibility of interpolation with the string "#$" ($ is an invalid global variable) or "#$123" ($123 is an invalid global variable), but it makes the inspection algorithm or the interpolation algorithm complicated to check the sequence after #$, so I guess that is why # is escaped even in such cases.

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