I'm trying to use the following code to replace two dots for only one:
我正在尝试使用以下代码仅替换一个两个点：
test<-"test..1"
gsub("\\..", ".", test, fixed=TRUE)
and getting:
得到：
[1] "test..1"
I tried several combinations of escape strings, including brackets [] with no success.
What am I doing wrong?
我尝试了几种转义字符串组合，包括方括号[]没有成功。我究竟做错了什么？
1 个解决方案
#1
31
If you are going to use fixed = TRUE, use the (non-interpreted) character .:
如果要使用fixed = TRUE，请使用（非解释）字符。
> gsub("..", ".", test, fixed = TRUE)
Otherwise, within regular expressions (fixed = FALSE), . has a special meaning (any character) so you'll want to prefix it with a backslash to mean "the dot character":
否则，在正则表达式中（fixed = FALSE）,.具有特殊含义（任何字符），因此您需要在其前面添加反斜杠以表示“点字符”：
> gsub("\\.\\.", ".", test)
> gsub("\\.{2}", ".", test)
#1
31
If you are going to use fixed = TRUE, use the (non-interpreted) character .:
如果要使用fixed = TRUE，请使用（非解释）字符。
> gsub("..", ".", test, fixed = TRUE)
Otherwise, within regular expressions (fixed = FALSE), . has a special meaning (any character) so you'll want to prefix it with a backslash to mean "the dot character":
否则，在正则表达式中（fixed = FALSE）,.具有特殊含义（任何字符），因此您需要在其前面添加反斜杠以表示“点字符”：
> gsub("\\.\\.", ".", test)
> gsub("\\.{2}", ".", test)