ruby 用反斜杠单引号替换单引号
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Replace single quote with backslash single quote
提问by bobomoreno
I have a very large string that needs to escape all the single quotes in it, so I can feed it to JavaScript without upsetting it. I have no control over the external string, so I can't change the source data.
我有一个非常大的字符串，需要对其中的所有单引号进行转义，因此我可以将它提供给 JavaScript 而不会打扰它。我无法控制外部字符串，因此无法更改源数据。
Example:
例子：
Cote d'Ivtheitroad -> Cote d\'Ivtheitroad
(the actual string is very long and contains many single quotes)
（实际字符串很长，包含很多单引号）
I'm trying to this by using gsubon the string, but can't get this to work:
我正在尝试通过gsub在字符串上使用来实现这一点，但无法使其正常工作：
a = "Cote d'Ivtheitroad"
a.gsub("'", "\\'")
but this gives me:
但这给了我：
=> "Cote dIvtheitroadIvtheitroad"
I also tried:
我也试过：
a.gsub("'", 92.chr + 39.chr)
but got the same result; I know it's something to do with regular expressions, but I never get those.
但得到了相同的结果；我知道这与正则表达式有关，但我从来没有得到这些。
回答by steenslag
The %q delimiters come in handy here:
%q 分隔符在这里派上用场：
# %q(a string) is equivalent to a single-quoted string
puts "Cote d'Ivtheitroad".gsub("'", %q(\\')) #=> Cote d\'Ivtheitroad
回答by Chowlett
The problem is that \'in a gsubreplacement means "part of the string after the match".
问题是\'在gsub替换中意味着“匹配后的字符串的一部分”。
You're probably best to use either the block syntax:
您可能最好使用块语法：
a = "Cote d'Ivtheitroad"
a.gsub(/'/) {|s| "\'"}
# => "Cote d\'Ivtheitroad"
or the Hash syntax:
或哈希语法：
a.gsub(/'/, {"'" => "\'"})
There's also the hacky workaround:
还有一个hacky解决方法：
a.gsub(/'/, '\#').gsub(/#/, "'")
回答by kukrt
# prepare a text file containing [ abcd\'efg ]
require "pathname"
backslashed_text = Pathname("/path/to/the/text/file.txt").readlines.first.strip
# puts backslashed_text => abcd\'efg
unslashed_text = "abcd'efg"
unslashed_text.gsub("'", Regexp.escape(%q|\'|)) == backslashed_text # true
# puts unslashed_text.gsub("'", Regexp.escape(%q|\'|)) => abcd\'efg
