String functions in R

August 25, 2011
By

[This article was first published on Digithead's Lab Notebook, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

Here’s a quick cheat-sheet on string manipulation functions in R, mostly cribbed from Quick-R’s list of String Functions with a few additional links.

  • substr(x, start=n1, stop=n2)
  • grep(pattern,x, value=FALSE, ignore.case=FALSE, fixed=FALSE)
  • gsub(pattern, replacement, x, ignore.case=FALSE, fixed=FALSE)
  • gregexpr(pattern, text, ignore.case=FALSE, perl=FALSE,
    fixed=FALSE)
  • strsplit(x, split)
  • paste(…, sep="", collapse=NULL)
  • sprintf(fmt, )
  • toupper/tolower(x)
  • nchar(x)

Also see Regular Expressions as used in R and R String processing.

Note: Just to be clear, R is far from an ideal platform for processing text. For anything where that’s the major concern, you’re better off going to Python or Ruby.

To leave a comment for the author, please follow the link and comment on their blog: Digithead's Lab Notebook.

R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.



If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.

Search R-bloggers

Sponsors

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)