[R] regular expression help

Duncan Mackay dulcalma at bigpond.com
Fri Jun 27 02:59:29 CEST 2014


You only have a vector of length 5 and I am not quite sure of the string you
are testing
so try this



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');

should return 3,4,5 and 6.

Thanks in advance for your help.

R-help at r-project.org mailing list
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

More information about the R-help mailing list