Please do your own homework: the help page says
For 'gregexpr' a list of the same length as 'text' each element of
which is an integer vector as in 'regexpr', except that the
starting positions of every (disjoint) match are given.
^^^^^^^^
If that is still not clear enough for you, please ask your supervisor for
remedial help.
On Fri, 12 Dec 2008, rthom...@aecom.yu.edu wrote:
Full_Name: Reid Thompson
Version: 2.8.0 RC (2008-10-12 r46696)
OS: darwin9.5.0
Submission from: (NULL) (129.98.107.177)
the gregexpr() function does NOT return a complete list of global matches as it
should. this occurs when a pattern matches two overlapping portions of a
string, only the first match is returned.
the following function call demonstrates this error (although this is not how I
initially discovered the problem):
gregexpr("11221122", paste(rep("1122", 10), collapse=""))
instead of returning 9 matches as one would expect, only 5 matches are returned
. . .
[[1]]
[1] 1 9 17 25 33
attr(,"match.length")
[1] 8 8 8 8 8
you will note, essentially, that the entire first match is then excluded from
subsequent matching
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Brian D. Ripley, rip...@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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