R help - Oct 2008 - Looking for position of character in a string

Hi all,

I would like to check if a string contains "." in it. If yes, I would
like
to know the position of "." in the string.

Eg: X<-"NM1236.3"

In above example, "." is at position 7.

I tried functions grep() and match(). It seems they couldn't detect
".".


Thanks in advance for your help,
Sityee

	[[alternative HTML version deleted]]

Try this:

gregexpr("\\.", X)

On Wed, Oct 1, 2008 at 3:56 PM, phoebe kong <sityeekong at gmail.com>
wrote:
> Hi all,
>
> I would like to check if a string contains "." in it. If yes, I
would like
> to know the position of "." in the string.
>
> Eg: X<-"NM1236.3"
>
> In above example, "." is at position 7.
>
> I tried functions grep() and match(). It seems they couldn't detect
".".
>
>
> Thanks in advance for your help,
> Sityee
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

> s1 <- "Hello.World"
> which(strsplit(s1, '')[[1]]=='.')
[1] 6 
> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of phoebe kong
> Sent: Wednesday, October 01, 2008 2:56 PM
> To: r-help at r-project.org
> Subject: [R] Looking for position of character in a string
> 
> Hi all,
> 
> I would like to check if a string contains "." in it. If yes, 
> I would like to know the position of "." in the string.
> 
> Eg: X<-"NM1236.3"
> 
> In above example, "." is at position 7.
> 
> I tried functions grep() and match(). It seems they couldn't 
> detect ".".
> 
> 
> Thanks in advance for your help,
> Sityee
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>