Re: [R] Regular expressions & sub

From: Bernd Weiss <bernd.weiss_at_uni-koeln.de>
Date: Fri 19 Aug 2005 - 15:23:14 EST

On 18 Aug 2005 at 21:17, Peter Dalgaard wrote:

> Dirk Eddelbuettel <edd@debian.org> writes:
>
> > Bernd Weiss <bernd.weiss <at> uni-koeln.de> writes:
> > > I am struggling with the use of regular expression. I got
> > >
> > > > as.character(test$sample.id)
> > > [1] "1.11" "10.11" "11.11" "113.31" "114.2" "114.3" "114.8"
> > >
> > >
> > > and need
> > >
> > > [1] "11" "11" "11" "31" "2" "3" "8"
> > >
> > > I.e. remove everything before the "." .
> >
> > Define the dot as the hard separator, and allow for multiple digits
> > before it:
> >
> > > sample.id <- c("1.11", "10.11", "11.11", "113.31", "114.2",
> > > "114.3", "114.8") gsub("^[0-9]*\.", "", sample.id)
> > [1] "11" "11" "11" "31" "2" "3" "8"
>
> Or, more longwinded, but with less assumptions about what goes before
> the dot:
>
> > gsub("^.*\\.(.*)$","\\1",sample.id)
> [1] "11" "11" "11" "31" "2" "3" "8"

Wow, thanks a lot for all the valuable suggestions.

Bernd



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