[R] Regex - subsetting parts of a file name.

arnaud gaboury arnaud.gaboury at gmail.com
Thu Jul 31 10:27:08 CEST 2014

A directory is full of data.frames cache files. All these files have
the same pattern:


my.cache.list <- c("df.subject_test.RData", "df.subject_train.RData",

I want to keep only the part inside the two points. After lots of
headache using grep() when trying something like this:


 I couldn't find a clean one liner and found this workaround:

my.cache.list <- gsub('df.','',my.cache.list)
my.cache.list <- gsub('.RData','',my.cache.list)

The two above commands do the trick, but a clean one line with some
regex expression would be a more "elegant" way.

Does anyone have any suggestion ?

TY for help

More information about the R-help mailing list