[R] Question to regular expressions

[Gabor Grothendieck]

Try this:

"^[[:digit:]]{6}$"

On Tue, Dec 2, 2008 at 10:48 AM, Antje <niederlein-rstat at yahoo.de> wrote:
> Hi Gabor,
>
> it works! Thank you very much! But I still don't understand the difference
> between [0-9] and [:digit:]...
>
> Ciao,
> Antje
>
>
> Gabor Grothendieck schrieb:
>>
>> 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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>>> http://www.R-project.org/posting-guide.html
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>>>
>>
>
>
>