[R] list files ignoring the case option

[Berton Gunter]

Simpler:First get uniform case. ?toupper or ?tolower


-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Sundar 
> Dorai-Raj
> Sent: Thursday, November 04, 2004 6:39 AM
> To: ramasamy at cancer.org.uk
> Cc: R-help
> Subject: Re: [R] list files ignoring the case option
> 
> 
> 
> Adaikalavan Ramasamy wrote:
> 
> > Sorry if this is a question more on regular expressions. I 
> am dealing
> > with several files which have been badly named. For example 
> the files
> > are given either the extensions txt, TXT or Txt. I wish to 
> select all
> > those files ending with 'txt' ignoring case.
> > 
> > Here is how I would do it in bash (Redhat FC2) :
> > 
> >    touch  a1.txt  a2.TXT  a3.Txt  txt.control  TXT.control
> >    ls -1 | grep -i "txt$"
> > 
> > 
> > Here is how I am currently doing it in R
> > 
> >    a <- list.files(all.files=T)
> >    grep( "txt$", a, ignore.case=T, value=T )
> > 
> > 
> > Is it possible for me to modify the following line to include ignore
> > case option ?
> > 
> >    a <- list.files( pattern="txt$" )
> > 
> > Thank you.
> > 
> > Regards, Adai
> > 
> 
> Not much of a regexpr guy myself, but the following should work:
> 
> list.files(pattern = "[tT][xX][tT]$")
> 
> There's probably a better answer though.
> 
> --sundar
> 
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