[R] regular expression help

[arun]

Hi,
You may try:
test[!grepl("(?<=AARSD1)[-\\d]", test, perl=T)]

A.K.




On Friday, June 27, 2014 6:43 AM, C Lin <baccts at hotmail.com> wrote:
Hi Duncan,

Thanks for trying to help. Sorry for not being clear.
The string I'd like to get is 'AARSD1'
It can be followed or preceded by white space or // or nothing

so, from test <- c('AARSD11','AARSD1-','AARSD1//','AARSD1 //','//AARSD1','AARSD1');

I want to match only 'AARSD1//','AARSD1 //','//AARSD1','AARSD1'

Thanks,
Lin
 



----------------------------------------
> From: dulcalma at bigpond.com
> To: baccts at hotmail.com; r-help at r-project.org
> Subject: RE: [R] regular expression help
> Date: Fri, 27 Jun 2014 10:59:29 +1000
>
> Hi
>
> You only have a vector of length 5 and I am not quite sure of the string you
> are testing
> so try this
>
> grep('[/]*\\<AARSD1\\>[/]*',test)
>
> Duncan
>
> Duncan Mackay
> Department of Agronomy and Soil Science
> University of New England
> Armidale NSW 2351
> Email: home: mackay at northnet.com.au
>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
> Behalf Of C Lin
> Sent: Friday, 27 June 2014 10:05
> To: r-help at r-project.org
> Subject: [R] regular expression help
>
> Dear R users,
>
> I need to match a string. It can be followed or preceded by whitespace or //
> or nothing.
> How do I code it in R?
>
> For example:
> test <- c('AARSD11','AARSD1-','AARSD1//','AARSD1 //','//AARSD1');
> grep('AARSD1(\\s*//*)',test);
>
> should return 3,4,5 and 6.
>
> Thanks in advance for your help.
>
> Lin
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