Well, Wikipedia is probably the place where people who know some topic can check if people who wrote the article did it right :)
You can try this short subchapter in R for Data Science (by Hadley Wickham) as a starting point: https://r4ds.had.co.nz/strings.html#matching-patterns-with-regular-expressions Best regards, Grzegorz pt., 22 paź 2021 o 15:14 Eric Berger <ericjber...@gmail.com> napisał(a): > > You can check out Wikipedia for regular expressions: > > https://en.wikipedia.org/wiki/Regular_expression > > > > > On Fri, Oct 22, 2021 at 3:48 PM Steven Yen <st...@ntu.edu.tw> wrote: > > > Thanks, it works! > > > > What can I read to understand more about this part "\\..*$" of the > > pattern? And more such as ^ and $ that I know from experience? > > > > On 2021/10/22 下午 06:22, Rui Barradas wrote: > > > Hello, > > > > > > Use ls() with argument pattern. It accepts a regex and returns a > > > vector of objects names matching the pattern. > > > > > > > > > rm(list = ls(pattern = "data\\..*$")) > > > > > > > > > Hope this helps, > > > > > > Rui Barradas > > > > > > Às 10:20 de 22/10/21, Steven Yen escreveu: > > >> I like to be able to use a command with something similar to a "wild > > >> card". Below, lines 4 works to delete all three dataframes, but line > > >> 5 does not work. Any elegant way to accomplish this? My list of > > >> dataframes can be long and so this would be convenient. > > >> > > >> data.1<-data.frame(x=1:3,y=4:6,z=7:9) > > >> data.2<-data.1 > > >> data.3<-data.1 > > >> rm(data.1,data.2,data.3) > > >> rm(data.*) > > >> > > >> ______________________________________________ > > >> 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. > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.