R gsub用单双引号引起来 [英] R gsub a single double quotation mark

问题描述

我在数据框中有一个字符串字段，它们都类似于：

I have a field of strings in a data frame all similar to:

"Young Adult – 8-9"" 

其中，内部单号是我想要替换为无用的东西：

where the inner single " is what I want to replace with nothing to get:

"Young Adult - 8-9"

我该怎么做？我试图用双反斜杠转义：

How can I do this? I tried to escape with a double backslash:

gsub("\\"", "", string)

但出现此错误：错误： gsub（ \， <中的意外字符串常量/ p>

but got this error: Error: unexpected string constant in "gsub("\"", ""

推荐答案

您无需在正则表达式中转义双引号，只需使用 \ 或''以匹配单引号。

You do not need to escape a double quote in a regular expression. Just use "\"" or '"' to match a single double quote.

s = "Young Adult – 8-9\""
s
[1] "Young Adult – 8-9\""
gsub("\"", "", s)
[1] "Young Adult – 8-9"
gsub('"', "", s)
[1] "Young Adult – 8-9"

请参见此IDEONE演示

注意：由于您要删除一些 literal 文本，因此您甚至不需要正则表达式，请使用 fixed = TRUE 参数来加快操作速度：

NOTE: Since you want to remove some literal text, you do not even need a regex, use fixed=TRUE argument to speed up the operation:

gsub('"', "", s, fixed=TRUE)

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