Ok then this code didn't do what I wanted. I want "not including 'arg' before
'.symptom'", not individual letters of "arg", but rather as a word.
Bill Dunlap suggested using invert=T, it works for single 1 condition, but not
for 2 conditions here: not including "arg" before ".", but at the same time,
does include ".symptom".
Any other suggestions would be appreciated
John
________________________________
From: Peter Langfelder <peter.langfel...@gmail.com>
Cc: Bernd Weiss <bernd.we...@uni-koeln.de>; r-help@r-project.org
Sent: Thu, March 31, 2011 5:55:26 PM
Subject: Re: [R] regular expression
> Thanks Bernd! I tried your approach with my real example, sometimes it worked,
> sometimes it didn't. For example
>
> grep('[^(arg)]\\.symptom',"stomach.symptom",value=T)
> [1] "stomach.symptom"
>
> grep('[^(arg)]\\.symptom',"liver.symptom",value=T)
> character(0)
>
> I think both examples should return the text, but the 2nd example didn't.
>
> What was wrong here?
Operator error :) Since you exclude 'r' before the '.', liver.symptom
does not match the pattern.
Peter
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