Try this:
x <- "This happened in the 21. century."
gregexpr("[[:digit:]]\\.", x)
This returns the position of the digit-dot in the string.
On Mon, Jun 8, 2009 at 11:15 AM, Mark Heckmann <mark.heckm...@gmx.de> wrote:
> Hi,
>
>
>
> i need to recognize itemization structures in strings which follow the
> format: "digit-digit-dot" like e.g.
>
>
>
> 1.
>
> 2.
>
> 19.
>
> 211.
>
>
>
> Given the string " This happened in the 21. century." (the dot behind 21 is
> used in German instead of 21st) I want know where the dots are but I do not
> want the 21.-dot to be returned as well.
>
>
>
> I am not good at regular expressions. How can I retrieve or recognize dots
> excluding the digit-digit-dot structure?
>
>
>
> TIA, Mark
>
>
>
> -------------------------------
>
> Mark Heckmann
>
> + 49 (0) 421 - 1614618
>
> www.markheckmann.de
>
> R-Blog: <http://ryouready.wordpress.com> http://ryouready.wordpress.com
>
>
>
>
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>
> ______________________________________________
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>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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