Mark, quick googling gives the answer - [.] is not what you think it is, you
probably meant [\.]. Bracket expressions starting with [. are collating symbols
which is unsupported by PCRE (only [:xxx:] is supported, neither [=xxx=] nor
[.xxx.] is) but that's probably not what you intended. See POSIX:
9.3.5 RE Bracket Expression
[...]
1. [..] The character sequences "[.", "[=", and "[:" (left-bracket followed by
a period, equals-sign, or colon) shall be special inside a bracket expression
and are used to delimit collating symbols, equivalence class expressions, and
character class expressions.
Cheers,
Simon
On Sep 16, 2011, at 12:45 AM, <mark.braving...@csiro.au>
<mark.braving...@csiro.au> wrote:
> Problem below with PCRE grep in R-devel; works fine in R-patched. (Unless
> there's been an absolutely massive change in rules for updated PCRE version
> 8.13; jeez I hope not)
>
>> grep( '[.][.]', '', perl=TRUE)
> Error in grep("[.][.]", "", perl = TRUE) :
> invalid regular expression '[.][.]'
> In addition: Warning message:
> In grep("[.][.]", "", perl = TRUE) : PCRE pattern compilation error
> 'POSIX collating elements are not supported'
> at '[.][.]'
>
>> sessionInfo()
> R Under development (unstable) (2011-09-13 r57004)
> Platform: i386-pc-mingw32/i386 (32-bit)
>
> locale:
> [1] LC_COLLATE=English_Australia.1252 LC_CTYPE=English_Australia.1252
> [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
> [5] LC_TIME=English_Australia.1252
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> NB I'm sending to R-devel rather than posting a bug report because (i) I have
> a dim recollection that's what we're supposed to do for bugs in R-devel, and
> (ii) Bugzilla doesn't include an R-devel version and (iii) couldn't find any
> guidance on these matters.
>
> Mark
>
> --
> Mark Bravington
> CSIRO Mathematical & Information Sciences
> Marine Laboratory
> Castray Esplanade
> Hobart 7001
> TAS
>
> ph (+61) 3 6232 5118
> fax (+61) 3 6232 5012
> mob (+61) 438 315 623
>
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>
>
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