[R] characters in a string

[David Winsemius]

On Sep 15, 2010, at 11:16 AM, rajeshj at cse.iitm.ac.in wrote:

>
> Hi,
>
> I need to check if a string "<rh>a,b,c,d<rh>" is delimited by two  
> "<rh>" 's as efficiently as possible(I need to do this a lot of  
> times) and return TRUE. Can someone suggest a good technique?

 > txt <- "<rh>a,b,c,d<rh>"
 >
 > grep("^<rh>.+<rh>$", txt)
[1] 1

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David Winsemius, MD
West Hartford, CT