[R] regexpr mystery can not remove trailing spaces

[Petr PIKAL]

Dear all

I encountered strange problem with regexpr replacement

I made this character object

str <- "02.06.10 12:40     "

> str(str)
 chr "02.06.10 12:40      "

I read in an object which seems to be quite similar

> str(as.character(becva$V1)[1])
 chr "02.06.10 12:40   "

However I can not remove trailing spaces from it

> sub(' +$', '', as.character(becva$V1[1]))

[1] "02.06.10 12:40   "
> sub(' +$', '', str)
[1] "02.06.10 12:40"
>

Do somebody have an idea what to do?

$version.string
[1] "R version 2.12.0 Under development (unstable) (2010-04-25 r51820)"

on Windows

Regards
Petr