search for: regexpress

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 u...

I think, we should give more hints on installing / using readline with R. Maybe there could be one ASCII file README-readline-Installation added to the FTP sites *and* to R-0.61.3.tar.gz explaining some the things Peter Dalgaard just said on R-help. I agree with Jan that it's a pity for non-programmer-hackers if they won't be able to use readline (most probably, these are the ones

Suppose a user submits a url: http://www.nyt.com/education/2345545. How can this be shortened to a cleaner url, like nyt.com? -- Posted via http://www.ruby-forum.com/.

Hi all R users Ive got a file that contains diffrent settings in the manor of: setting1="value1" setting2="value2" setting3="value3" setting4="value4" . . . What I want to do is open the file and change the value of a specific setting like wanna change setting4="value4" -> setting4="value5" and then save the file again.