On Jun 26, 2014, at 6:11 PM, C Lin 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'
Perhaps you want jsut
grepl('^AARSD1//$|^AARSD1 //$|^//AARSD1$|^AARSD1', test)
> grepl('^AARSD1//$|^AARSD1 //$|^//AARSD1$|^AARSD1$', test)
[1] FALSE FALSE TRUE TRUE TRUE TRUE
--
David.
>
> Thanks,
> Lin
>
> ----------------------------------------
>> From: dulca...@bigpond.com
>> To: bac...@hotmail.com; r-help@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: mac...@northnet.com.au
>>
>> -----Original Message-----
>> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
>> Behalf Of C Lin
>> Sent: Friday, 27 June 2014 10:05
>> To: r-help@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.
>>
>
David Winsemius
Alameda, CA, USA
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