[R] regex and sub

[arnaud Gaboury]

Of course this helps! 
I didn't noticed the difference between sub and gsub.

TY




> -----Original Message-----
> From: Bernd Weiss [mailto:bernd.weiss at uni-koeln.de]
> Sent: Friday, May 14, 2010 12:23 PM
> To: arnaud Gaboury
> Cc: r-help at r-project.org
> Subject: Re: [R] regex and sub
> 
> Am 14.05.2010 12:10, schrieb arnaud Gaboury:
> > Dear group,
> >
> > Here is an object:
> >
> > z <-
> > c("LSCPos100415.csv", "LSCPos100416.csv", "LSCPos100419.csv",
> > "LSCPos100420.csv", "LSCPos100421.csv", "LSCPos100422.csv",
> > "LSCPos100423.csv",
> > "LSCPos100426.csv", "LSCPos100427.csv", "LSCPos100428.csv",
> > "LSCPos100429.csv",
> > "LSCPos100430.csv", "LSCPos100503.csv", "LSCPos100504.csv",
> > "LSCPos100505.csv",
> > "LSCPos100506.csv", "LSCPos100507.csv", "LSCPos100510.csv",
> > "LSCPos100511.csv",
> > "LSCPos100512.csv", "LSCPos100513.csv")
> >
> > I want to keep only the numeric part of each element.
> > I thought using something like :
> >
> >> sub("REGEX","",y)
> >
> > I tried something with " \\D+", but it is not the final result I want
> >
> >> sub("\\D+","",y)
> >  [1] "100415.csv" "100416.csv" "100419.csv" "100420.csv" "100421.csv"
> > "100422.csv" "100423.csv" "100426.csv" "100427.csv" "100428.csv"
> > "100429.csv" "100430.csv" "100503.csv" "100504.csv" "100505.csv"
> > [16] "100506.csv" "100507.csv" "100510.csv" "100511.csv" "100512.csv"
> > "100513.csv"
> 
> 
> > gsub("\\D","",z)
>  [1] "100415" "100416" "100419" "100420" "100421" "100422" "100423"
> "100426"
>  [9] "100427" "100428" "100429" "100430" "100503" "100504" "100505"
> "100506"
> [17] "100507" "100510" "100511" "100512" "100513"
> 
> HTH,
> 
> Bernd