Re: [R] Finding non disjoint regular expressions

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Mon, 05 May 2008 10:56:57 -0400

Try this:

gregexpr("A(?=AA)","AAAAAA", perl = TRUE)

Read about zero width lookahead assertions at ?regex

On Mon, May 5, 2008 at 10:16 AM, Schraga Schwartz <Schragas_at_post.tau.ac.il> wrote:
> Hello,
>
>
>
> Is there any way I can use the gregexpr functions (or a different function)
> in a manner that will also return overlapping (i.e. non disjoint) regular
> expressions?
>
>
>
> For instance, when running gregexpr("AAA","AAAAAA"), I get two matches, one
> at position 1 and one at position 4. I'd like to receive 4 matches at
> positions 1, 2, 3 and 4.
>
>
>
> Thanks,
>
>
>
> Schraga Schwartz
>
> Department of Human Molecular Genetics and Biochemistry,
> Tel Aviv University Medical School,
> Tel Aviv 69978, Israel.
> Tel: +972-3-640 6894
>
> email: schragas_at_post.tau.ac.il
>
>
>
>
> [[alternative HTML version deleted]]
>
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>



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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. Received on Mon 05 May 2008 - 15:43:26 GMT

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