Message-ID: <Pine.LNX.4.64.0604241617220.31423@gannet.stats.ox.ac.uk>
Date: 2006-04-24T15:18:14Z
From: Brian Ripley
Subject: gsub + backslashes
In-Reply-To: <Pine.LNX.4.64.0604241620370.12055@imbe153.imbe.med.uni-erlangen.de>
On Mon, 24 Apr 2006, Torsten Hothorn wrote:
>
> Dear developeRs,
>
> I thought that backslashes can be escaped in the usual way (and I think I
> did this before) but I can't see why
>
> R> gsub("\\", "x", "\alpha")
> Error in gsub(pattern, replacement, x, ignore.case, extended, fixed,
> useBytes) :
> invalid regular expression '\'
>
> gives an error. Or am I just blind?
Escape for R and escape for regexp:
> gsub("\\\\", "x", "\\alpha")
[1] "xalpha"
--
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