On Wed, 26 Nov 2003, John W. Eaton wrote:
> On 26-Nov-2003, Martin Maechler <[EMAIL PROTECTED]> wrote:
>
> | >>>>> " Kurt" == Kurt Hornik <[EMAIL PROTECTED]>
> | >>>>> on Wed, 26 Nov 2003 10:05:42 +0100 writes:
> |
> | Kurt> Right. In any case, an explicit glob() function
> | Kurt> seems preferable to me ...
> |
> | Good idea!
> |
> | More than 12 years ago, I had a similar one, and wrote a
> | "pat2grep()" {pattern to grep regular expression} function
> | --- for S-plus on Unix --- which I have now renamed to glob2regexp():
> | -- still not really usable outside unix (or windows with the
> | 'sed' tool in the path), nor perfect, but maybe a good start:
> |
> | sys <- function(...) system(paste(..., sep = ""))
> |
> | glob2regexp <- function(pattern)
> | {
> | ## Purpose: Change "ls pattern" to "grep regular expression" pattern.
> | ## -------------------------------------------------------------------------
> | ## Author: Martin Maechler ETH Zurich, ~ 1991
> | sys("echo '", pattern, "'| sed ",
> | "'s/\\./\\\\./g;s/*/.*/g;s/?/./g; s/^/^/;s/$/$/; s/\\.\\*\\$$//'")
> | }
>
> It seems to me that using this approach to implement a proper glob()
> function would be more work than using the glob code that is available
> as part of bash, which I think will allow you to handle much more
> complex patterns, including [xyz] {a,b,c} etc.
Or even the glob code from Perl, which is cross-platform. It is not clear
to me what we would want glob() to do on Windows, BTW.
--
Brian D. Ripley, [EMAIL PROTECTED]
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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