Splitting a file name into name,extension

by

Use strsplit:

R> strsplit("name1.csv", "\\.")[[1]]
[1] "name1" "csv"  
R>

Note that you a) need to escape the dot (as it is a metacharacter for regular expressions) and b) deal with the fact that strsplit() returns a list of which typically only the first element is of interest.

A more general solution involves regular expressions where you can extract the matches.

For the special case of filenames you also have:

R> library(tools)   # unless already loaded, comes with base R
R> file_ext("name1.csv")
[1] "csv"
R>

and

R> file_path_sans_ext("name1.csv")
[1] "name1"
R>

as these are such a common tasks (cf basename in shell etc).

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