Re: [Rd] gregexpr (PR#9965)

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu, 11 Oct 2007 09:47:10 +0100 (BST)

This was a deliberate change for R 2.4.0 with SVN log:

r38145 | rgentlem | 2006-05-20 23:58:14 +0100 (Sat, 20 May 2006) | 2 lines fixing gregexpr infelicity

So it seems the author of gregexpr believed that the bug was in 2.3.1, not 2.5.1.

On Wed, 10 Oct 2007, dolanp_at_science.oregonstate.edu wrote:

> Full_Name: Peter Dolan
> Version: 2.5.1
> OS: Windows
> Submission from: (NULL) (128.193.227.43)
>
>
> gregexpr does not find all matching substrings if the substrings overlap:
>
>> gregexpr("abab","ababab")
> [[1]]
> [1] 1
> attr(,"match.length")
> [1] 4
>
> It does work correctly in Version 2.3.1 under linux.

'correctly' is a matter of definition, I believe: this could be considered to be vaguely worded in the help.

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-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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