Thank you! This is definitely an improvement!
Best, Ales Ziberna -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter Dalgaard Sent: Wednesday, January 11, 2006 7:24 PM To: Ales Ziberna Cc: r-help@stat.math.ethz.ch Subject: Re: [R] Regular expressions "Ales Ziberna" <[EMAIL PROTECTED]> writes: > Matching regular expressions > > Dear useRs! > > I have the following problem. I would like to find objects in my > environment that have two strings in it. For example, I might want to > find objects that have in their names "MY" and "TARGET". I do not care > about the ordering of these two substrings in the name, neither what > is in front, behind or between them, the only thing important is that > both words are present. I apologize if this is covered in help pages > (then I did not understand it by reading them several times) or it was > answered previously (then I did not find it). > > Since "ls" with argument pattern essentially uses "grep" (if I am not > mistaken), I have an example for "grep" > > text<-c("somethigMYsomthing elseTARGET another thing","MY somthing > TARGET another thing","somethig somthing elseTARGETMY another > thing","somethigMTARGETY another thing") > > grep(pattern="MY&TARGET", x=text) > #I would like to get 1 2 3 and not 4 or actually their names using > text[grep(pattern="MY&TARGET", x=text)] #of course, the "pattern" in > this case is wrong > > I know I can do > > text[grep(pattern="MY", x=text)][grep(pattern="TARGET", > x=text[grep(pattern="MY",x=text)])] > > However I hope there exists a more elegant way. Perhaps this? text[intersect(grep("MY",text), grep("TARGET",text))] -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
