How can I remove an expression that is stored in a variable from a string in base R?-CodePudding

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How can I remove an expression that is stored in a variable from a string in base R?

Time：12-06

For example, I have variable x = "a1" while I also have another variable y = "5a1". How could I make y = "5" while still using the x variable?

I tried using gsub() with \ \ but it only seems to work if it is inside double quotes. Is there a variable equivalent for \ \ ?

CodePudding user response：

You can do:

x <- "a1"
y <- "5a1"
gsub(pattern = paste0(x, "$"), replacement = "", x = y)

$ is used to match end of string