"\\b" is a zero length match. strsplit seems to chop at least one character off the beginning of the string if it sees a match, and then it looks at the shortened string that remains and repeats. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity.
On July 11, 2015 7:47:22 AM PDT, Bert Gunter <bgunter.4...@gmail.com> wrote: >I noticed the following: > >> strsplit("red green","\\b") >[[1]] >[1] "r" "e" "d" " " "g" "r" "e" "e" "n" > >> strsplit("red green","\\W") >[[1]] >[1] "red" "green" > >I would have thought that "\\b" should give what "\\W" did. Note that: > >> grep("\\bred\\b","red green") >[1] 1 >## as expected > >Does strsplit use a different regex engine than grep()? Or more >likely, what am I misunderstanding? > >Thanks. > >Bert > > >Bert Gunter > >"Data is not information. Information is not knowledge. And knowledge >is certainly not wisdom." > -- Clifford Stoll > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >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 -- To UNSUBSCRIBE and more, see 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.