[R] Regular Expression returning unexpected results

[Sarah Goslee]

On Tue, Oct 29, 2013 at 1:13 PM, Lopez, Dan <lopez235 at 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