[R] Finding non disjoint regular expressions

[Gabor Grothendieck]

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
>
>
>
>
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