R help - Dec 2008 - Question to regular expressions

Hi there,

I know, this question is not directly an R-help question but probably someone 
can give me a hint how to deal with the following problem.

I have a vector with file/folder names and want to filter for all entries which 
  have 6 numbers in a row and nothing else.

folders <- c("folder1", "f2", "F234562",
"12345678", "234567", "912345", "333")

I'd like to get only "234567" and "912345".
Can anybody help me creating a regex for this???

For example this regex:

regexpr("[^:digit:$]{6}", folders)

would match "F234562", "12345678", "234567",
"912345"


Antje

Try this:
> folders <- c("folder1", "f2", "F234562",
"12345678", "234567", "912345", "333")
> grep("^[0-9]{6}$", folders, value = TRUE)
[1] "234567" "912345"


On Tue, Dec 2, 2008 at 10:32 AM, Antje <niederlein-rstat at yahoo.de>
wrote:
> Hi there,
>
> I know, this question is not directly an R-help question but probably
> someone can give me a hint how to deal with the following problem.
>
> I have a vector with file/folder names and want to filter for all entries
> which  have 6 numbers in a row and nothing else.
>
> folders <- c("folder1", "f2", "F234562",
"12345678", "234567", "912345",
> "333")
>
> I'd like to get only "234567" and "912345".
> Can anybody help me creating a regex for this???
>
> For example this regex:
>
> regexpr("[^:digit:$]{6}", folders)
>
> would match "F234562", "12345678", "234567",
"912345"
>
>
> Antje
>
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