[R] Perl-style regexes and capturing results

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu May 4 16:00:27 CEST 2006

On Thu, 4 May 2006, Sean Davis wrote:

> Just a quick question....
> In perl, I can capture parts of a regex like /(\w)\/(\d)/ to get back $1 and
> $2 containing the parts of the regex in parentheses.  Is there a parallel in
> R?

Yes.  See ?gsub and especially the examples.  This is not specific to 
Perl, and \1 and \2 are more commonly used, including in R.

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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