How to remove specific pattern in string?

Question

I have data in that string is like f <- "./DAYA-1178/10TH FEB.xlsx". I would like to extract only DAYA-1178

what I have tried is

f1 <- gsub(".*./","", f) 

But it is giving last result of my file "10TH FEB.xlsx"

Appreciate any lead.

Answer 1

It seems you are dealing with files. You need the basename of the directory:

basename(dirname(f))
[1] "DAYA-1178"

or you could do:

sub(".*/","",dirname(f))
[1] "DAYA-1178"