On Mon, Dec 1, 2008 at 12:20 AM, Wacek Kusnierczyk
<[EMAIL PROTECTED]> wrote:
> Gabor Grothendieck wrote:
>> Try this:
>>
>>
>>> vec <- c("aaaa", "baaa", "bbaa", "bbba", "baamm", "aa")
>>>
>>
>>
>>> grep("^(?!(.)\\1{1,}$).*(.)\\2{1,}$", vec, perl = TRUE)
>>>
>
> or even
>
> grep("^(?!(.)\\1+$).*(.)\\2+$", vec, perl = TRUE)
>
Or combining the previous simplification I posted with yours:
> grep("^(?!(.)\\1+$).*(.)\\2$", vec, perl = TRUE)
[1] 2 3 5
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