dot means any character and * repeats it for as many times as possible so it replaces eveything (.*) up to the last dot (\\.) with nothing.
On Wed, Jul 29, 2009 at 9:43 AM, Petr PIKAL<petr.pi...@precheza.cz> wrote: > Thank you > > Gabor Grothendieck <ggrothendi...@gmail.com> napsal dne 29.07.2009 > 15:20:40: > >> Here are a couple of possibilities: >> >> sub(".*\\.", "", s) > > This seems to be the target. Can you be so kind and translate for me what > it really does? > > ".* matches several dots? > \\. what is this? > > I thought sub finds a match and replaces "replacement" in a string. But > from this solution it seems that the command replaces all characters in a > string with empty string and leave only value after three or two dots? Am > I right? > > Best regards > Petr > > > >> >> library(gsubfn) >> strapply(s, "[0-9]*$", simplify = c) >> >> >> >> On Wed, Jul 29, 2009 at 9:10 AM, Petr PIKAL<petr.pi...@precheza.cz> > wrote: >> > Hi all >> > >> > I have got something like that (actually those are column names) >> > >> > [51] "X19.2.300b...80" "X19.2.400v...80" "X19.2.400b...80" >> > "X19.2.300v...90" "X19.2.300b...90" >> > [56] "X19.2.400v...90" "X19.2..400b..90" "X19.2.300v...100" >> > "X19.2.300b...100" "X19.2.400v...100" >> > >> > in character vector. I would like to get last n figures from this >> > character vector but my regexpr unerstanding is inferior and I did not >> > succeed. >> > Please, is there anybody who can extract those n digits from end of > each >> > character string? If there were only 2 digits I could use substr but > there >> > can be one, two or three digits. >> > >> > I tried several variations of >> > >> > gsub("0:9$", "\\1" ,names(foto)[10]) >> > >> > but either got whole string or an error. >> > >> > Best regards >> > Petr >> > >> > ______________________________________________ >> > R-help@r-project.org mailing list >> > https://stat.ethz.ch/mailman/listinfo/r-help >> > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html >> > and provide commented, minimal, self-contained, reproducible code. >> > > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.