Oh,great.
Thanks.

On 8/7/07, Stephen Tucker <brown_emu@yahoo.com> wrote:
>
> try
>
> grep(paste("^",b[2],"$",sep=""),a)
>
>
> your version will match "b2":
>
> > grep("^b[2]$",c("b","b2","b3"))
> [1] 2
>
>
> --- Shao <xshining@gmail.com> wrote:
>
> > Hi,everyone.
> >
> > I have a problem when using the grep.
> > for example:
> > a <- c("aa","aba","abac")
> > b<- c("ab","aba")
> >
> > I want to match the whole word,so
> > grep("^aba$",a)
> > it returns 2
> >
> > but when I used it a more useful way:
> > grep("^b[2]$",a),
> > it doesn't work at all, it can't find it, returning integer(0).
> >
> > How can I chang the format in the second way?
> >
> > Thanks.
> >
> > --
> > Shao
> >
> >       [[alternative HTML version deleted]]
> >
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> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
>
>
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-- 
Shao

	[[alternative HTML version deleted]]

