Message-ID: <x2lm3cz31d.fsf@biostat.ku.dk>
Date: 2002-11-29T17:41:50Z
From: Peter Dalgaard
Subject: Regular Expressionsionism
In-Reply-To: <sde7aef9.061@dss2.med.gu.se>
"Derek Eder" <Derek.Eder at neuro.gu.se> writes:
> Isn't there a cryptic footnote somewhere in the blue book that describes regular expressions as "a funny little language ..." ? Well, I'm not laughing!
>
> I've googled and Man paged, but the GREP-style solution to the following problem still eludes me:
>
> ... Using a regular expression in the "pattern" argument to list.files() to restrict the return to filenames which
> contain both "Elstim" and "post". E.g.,
>
> >list.files()
> ...
> [133] "J30710_Control_msa_amplitude_5_25_s1-30w.pre"
> [134] "J30710_Elstim_msa_amplitude_5_25_s1-30w.post"
> [135] "J30710_Elstim_msa_amplitude_5_25_s1-30w.pre"
> [136] "J30712_Control_msa_amplitude_5_25_s1-41_44-46_48w.post"
> [137] "J30712_Control_msa_amplitude_5_25_s1-41_44-46_48w.pre"
> [138] "J30712_Elstim_msa_amplitude_5_25_s1-17_19-43_45_48w.post"
>
> I have not found the key to generating the logical AND equivalent of the "|" OR infix operator, a
> proxy for the simpleton's dream: my.list.files(pattern="*Elstim" & "*post")
As long a you know the order, how about "Elstim.*post" ?
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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