在 Ruby 中转义和取消转义字符串的最佳方法? [英] Best way to escape and unescape strings in Ruby?

问题描述

Ruby 是否有任何内置方法来转义 和 非转义字符串?过去，我使用过正则表达式；然而，我突然想到 Ruby 可能一直在内部进行此类转换.也许这个功能在某处公开.

Does Ruby have any built-in method for escaping and unescaping strings? In the past, I've used regular expressions; however, it occurs to me that Ruby probably does such conversions internally all the time. Perhaps this functionality is exposed somewhere.

到目前为止，我已经想出了这些功能.他们工作，但他们似乎有点hacky:

So far I've come up with these functions. They work, but they seem a bit hacky:

def escape(s)
  s.inspect[1..-2]
end

def unescape(s)
  eval %Q{"#{s}"}
end

有更好的方法吗?

推荐答案

Ruby 2.5 添加了 String#undump 作为 String#dump:

Ruby 2.5 added String#undump as a complement to String#dump:

$ irb
irb(main):001:0> dumped_newline = "
".dump
=> ""\n""
irb(main):002:0> undumped_newline = dumped_newline.undump
=> "
"

有了它:

def escape(s)
  s.dump[1..-2]
end

def unescape(s)
  ""#{s}"".undump
end

$irb
irb(main):001:0> escape("
 " \")
=> "\n \" \\"
irb(main):002:0> unescape("\n \" \\")
=> "
 " \"

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