R help - Aug 2009 - regexp help needed.

Hi,

I posted yesterday with a problem in a script. I still have the same problem,
but I think I found a better way to explain my problem.

I have a vector of character strings. Each string is unique, including numbers
and letters. In the real world they represent a list of codes, so each position
in the string has a meaning to me. I want to make a subset of the vector using
"wildcards". So for example, take all the strings that start with 3.

Any ideas how to do that?

Thanks for any help.



      
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See this example:

Str <- c("345asd", "31qwe", "234tyu",
"40kjhg")
grep("^3", Str, value = TRUE)
split(Str, substr(Str, 1, 1))

On Fri, Aug 28, 2009 at 7:29 AM, Carlos Gonzalo Merino Mendez <
carlosgmerino@yahoo.com> wrote:
> Hi,
>
> I posted yesterday with a problem in a script. I still have the same
> problem, but I think I found a better way to explain my problem.
>
> I have a vector of character strings. Each string is unique, including
> numbers and letters. In the real world they represent a list of codes, so
> each position in the string has a meaning to me. I want to make a subset of
> the vector using "wildcards". So for example, take all the
strings that
> start with 3.
>
> Any ideas how to do that?
>
> Thanks for any help.
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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