Dear list memebers,
I am stuck with using regular expressions.
Imagine I have a vector of character strings like:
test <- c('filename_1_def.pdf', 'filename_2_abc.pdf')
How could I use regexpressions to extract only the 'def'/'abc' parts of these
strings?
Some try from my side yielded no results:
testresults <- grep('(?<=filename_[[:digit:]]_).{1,3}(?=.pdf)', perl = TRUE,
value = TRUE)
Somehow I seem to miss some important concept here. Until now I always used
nested sub expressions like:
testresults <- sub('.pdf$', '', sub('^filename_[[:digit:]]_', '' , test))
but this tends to become cumbersome and I was wondering whether there is a more
elegant way to do this?
Thanks for any help
Jannis
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