Get filename without extension in R

Question

I have a file:

ABCD.csv 

The length before the .csv is not fixed and vary in any length.

How can I extract the portion before the .csv?

Answer 1

There's a built in file_path_sans_ext from the standard install tools package that grabs the file without the extension.

tools::file_path_sans_ext("ABCD.csv")
## [1] "ABCD"