替换R中的文本时出错

Question

我用sub替换R中的一个文本.

 x<-"My name is ${name}"
 sub("${name}","Tiger",x)

错误信息:

Error in sub("${name}", "Tiger", x) : 
  invalid regular expression '${name}', reason 'Invalid contents of {}'

输入文本有{},如何修复此错误？

Answer 1

$,{并且}需要转义:

sub("\\$\\{name\\}","Tiger",x)
# [1] "My name is Tiger"

Answer 2

使用fixed=TRUE参数:

sub("${name}","Tiger",x, fixed=TRUE)
# [1] "My name is Tiger"