regexp with [:upper:] (PR#11032)

That is correct: I suspect you meant the character class [[:upper:]]

grep( '[[:upper:]]', letters, val=TRUE) character(0)

You asked for matches amongst :upper:, and that is what you got.
As ?rexexp does say

      (Note that the
      brackets in these class names are part of the symbolic
names, and
      must be included in addition to the brackets delimiting the    
bracket list.) 

this appears to be a homework failure.

On Tue, 25 Mar 2008, mark.bravington at csiro.au wrote:

Full_Name: Mark Bravington
Version: 2.6.2 patched
OS: Windows XP Pro
Submission from: (NULL) (140.79.22.104)

grep( '[:upper:]', letters, val=T) # shurely shouldn't

match anything ??

[1] "e" "p" "r" "u"

The converse ( '[:lower:]' and LETTERS) seems to work OK.

--please do not edit the information below--

Version:
platform = i386-pc-mingw32
arch = i386
os = mingw32
system = i386, mingw32
status = Patched
major = 2
minor = 6.2
year = 2008
month = 03
day = 21
svn rev = 44836
language = R
version.string = R version 2.6.2 Patched (2008-03-21 r44836)

Windows XP (build 2600) Service Pack 2

Locale:

LC_COLLATE=English_Australia.1252;LC_CTYPE=English_Australia.1252;LC_M

ONETARY=English_Australia.1252;LC_NUMERIC=C;LC_TIME=English_Australia.

1252

Search Path:
.GlobalEnv, package:stats, package:graphics, package:grDevices,
package:utils, package:datasets, package:methods, Autoloads, pa