Replacing square brackets with curly brackets in R

Question

Can anybody tell me how to replace square brackets with curly brackets in R. For example [1,2,3] to {1,2,3}. I know it could be done with "gsub" function but do not know how.

Answer 1

Here you have a possible option using gsub twice:

gsub("\\]", "}", gsub("\\[", "{", "[1, 2, 3]"))

It first replaces ] for } and then [ for { to the resulting string.

Answer 2

We can use gsub to remove the [] and then paste the {}

paste0("{", gsub("[][]", "", str1), "}")
#[1] "{1,2,3}"

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Or another option is chartr

chartr("[]", "{}", str1)
#[1] "{1,2,3}"

data

str1 <- "[1,2,3]"