Is there any other function or package to obtain extensions in filenames? I tried using file_ext() function from R package library(R.utils), it works on Rtsudio server but fails to work on shiny server.
If all else fails, there is always regex:
gsub("(.+)\\.(.+?$)","\\2", "file.info") ># info gsub("(.+)\\.(.+?$)","\\2", "htmls.peeples") ># peeples
Combine with basename() to clean up file paths.
basename()
file_ext() is in the tools package, which isn't automatically loaded.
file_ext()
tools