R help - Jun 2014 - 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

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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