Thanks for your help and for the info on the website. I did not know what to call regular expressions and so I could not search for them. Cheers! d
On Mon, May 24, 2010 at 7:08 PM, <richard.cot...@hsl.gov.uk> wrote: >> I am making a list of all the files in a folder and I want to exclude >> one file called "proj.current". This is the 31st file in a folder. >> Currently I use the command: >> >> tdirs <- list.files(pattern="proj.")[-31] >> >> However I would like to exclude it based on its name and not the > position. > > You need to update the pattern in the regular expression to look for > strings beginning with "proj.", but not having "current" afterwards. > > My first thought was to use perl style regular expressions, but apprently > this isn't supported. > tdirs <- list.files(pattern = "proj\\.(?!current)", perl=TRUE) #Throws > error > > Instead, you're probably better off doing it in two steps. > tdirs <- list.files(pattern="proj\\.") > tdirs <- tdirs[tdirs != "proj.current"] > > Notice the difference between "proj." and "proj\\.". The first means > 'proj followed by any character', and the second means 'proj followed by a > dot'. See http://www.regular-expressions.info/quickstart.html for more > info on regexes. > > Regards, > Richie. > > Mathematical Sciences Unit > HSL > > > ------------------------------------------------------------------------ > ATTENTION: > > This message contains privileged and confidential information intended > for the addressee(s) only. If this message was sent to you in error, > you must not disseminate, copy or take any action in reliance on it and > we request that you notify the sender immediately by return email. > > Opinions expressed in this message and any attachments are not > necessarily those held by the Health and Safety Laboratory or any person > connected with the organisation, save those by whom the opinions were > expressed. > > Please note that any messages sent or received by the Health and Safety > Laboratory email system may be monitored and stored in an information > retrieval system. > ------------------------------------------------------------------------ > Think before you print - do you really need to print this email? > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------ > Scanned by MailMarshal - Marshal's comprehensive email content security > solution. Download a free evaluation of MailMarshal at www.marshal.com > ------------------------------------------------------------------------ > -- Daisy Englert Duursma Room E8C156 Dept. Biological Sciences Macquarie University NSW 2109 Australia Tel +61 2 9850 9256 10A Carrington Rd Hornsby, NSW 2077 Mobile: 0421858456 ______________________________________________ R-help@r-project.org mailing list 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.
