On Sun, Oct 14, 2012 at 3:13 AM, siddu479 <onlyfordigitalst...@gmail.com> wrote: > Hi Experts, > > This might be silly question that I am asking, but no way as I am new to > R. > I want to list the files in a directory using regular expression like > A_B*_C*.csv etc. > How to make this possible in R ? > I tried like this list.files(dir=".", pattern="A_B*_C*.csv") but this gives > no output, whereas list.files(.... pattern="*.csv") giving all the .csv > files in the output, which I do not want. >
1. Always read the help file: ?list.files The argument name is path=, not dir=. 2. Also note that the pattern must be specified as a regular expression and not a glob (as would be specified in a command line shell). For example, the B* part of the expression in your post means 0 or more B's. It does not mean B followed by anything else. If you want to use globs rather than regular expressions see ?glob2rx -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ 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.
