gregexpr (PR#9965)

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.

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)
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