[Rd] Regular expressions

Prof Brian Ripley ripley at stats.ox.ac.uk
Sat Sep 23 11:43:35 CEST 2006

On Sat, 23 Sep 2006, Dominick Samperi wrote:

> When I type
> ls("package:base", pattern="log*")
> functions with names like "floor" and
> "Sys.setlocale" are included. I don't
> think this is how "*" is supposed to work.
> To get the desired response I have to use:
> ls("packge:base", pattern="logg*")

If you want a wildcard-like behaviour, use glob2rx, e.g.

> glob2rx("log*")
[1] "^log"

> I thought "log*" means "log" followed by anything?

Please read ?regexp.
It means 'lo' followed by zero or more occurrences of 'g'.

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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