On Tue, Oct 29, 2013 at 1:13 PM, Lopez, Dan <lopez...@llnl.gov> wrote: > grep("^([a-z]+) +\1 +[a-z]+ [0-9]",lines)
Your expression has a typo: R> grep("^([a-z]+) +\\1 +[a-z]+ [0-9]",lines) [1] 2 -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.