Hi, In the list.files() function, there is an argument 'pattern' to locate the desired files. However I failed to see if I can manage to fetch those files that having an exact match. For example, if there are 2 files that contain the expression 'File' and 'Second_File', then I should get the 1st one. However R is returning both the files. Any pointer on how to achieve that would be helpful. Thanks, [[alternative HTML version deleted]]
pattern = "^File$" Best, Ista On Wed, Sep 12, 2018 at 7:53 AM Christofer Bogaso <bogaso.christofer at gmail.com> wrote:> > Hi, > > In the list.files() function, there is an argument 'pattern' to locate the > desired files. However I failed to see if I can manage to fetch those files > that having an exact match. > > For example, if there are 2 files that contain the expression 'File' and > 'Second_File', then I should get the 1st one. However R is returning both > the files. > > Any pointer on how to achieve that would be helpful. Thanks, > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.
Study regular expressions via ?regex or any of the many websites you can find with a search engine. With no special characters, your search pattern matches anywhere in the string. Start your study by learning about the ^ and $ characters. On September 12, 2018 4:53:09 AM PDT, Christofer Bogaso <bogaso.christofer at gmail.com> wrote:>Hi, > >In the list.files() function, there is an argument 'pattern' to locate >the >desired files. However I failed to see if I can manage to fetch those >files >that having an exact match. > >For example, if there are 2 files that contain the expression 'File' >and >'Second_File', then I should get the 1st one. However R is returning >both >the files. > >Any pointer on how to achieve that would be helpful. Thanks, > > [[alternative HTML version deleted]] > >______________________________________________ >R-help at 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.-- Sent from my phone. Please excuse my brevity.