Extract file extension from file path

Solution 1:

This is the sort of thing that easily found with R basic tools. E.g.: ??path.

Anyway, load the tools package and read ?file_ext .

Let me extend a little bit great answer from https://stackoverflow.com/users/680068/zx8754

Here is the simple code snippet

  # 1. Load library 'tools'
  library("tools")

  # 2. Get extension for file 'test.txt'
  file_ext("test.txt")

The result should be 'txt'.

simple function with no package to load :

getExtension <- function(file){ 
    ex <- strsplit(basename(file), split="\\.")[[1]]
    return(ex[-1])
}