[R] unexpected behaviour of sub() / usage of regexp
Dear R users,
the way I understand the documentation of sub() and regexp the following code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to 2
(maximum) digits, i.e. numbers and not the 'e' in the string. Do I misinterpret
something here?
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] unexpected behaviour of sub() / usage of regexp
On 09/12/2011 9:20 AM, Jannis wrote:
Dear R users,
the way I understand the documentation of sub() and regexp the following code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to 2
(maximum) digits, i.e. numbers and not the 'e' in the string. Do I misinterpret
something here?
I get your expected output of ewww running 2.14.0 or 2.14.0-patched on
Windows. So it's not a universal problem...
Duncan Murdoch
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] unexpected behaviour of sub() / usage of regexp
This is AFAICS an instance of bug PR#14408 : it seems that in UTF-8
locales the grammar generated by the TRE engine for repetitions is in
odd cases buggy. And as the author has vanished, our hopes of his
fixing it are slim.
Try perl=TRUE .
On 09/12/2011 14:20, Jannis wrote:
Dear R users,
the way I understand the documentation of sub() and regexp the following code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to 2
(maximum) digits, i.e. numbers and not the 'e' in the string. Do I misinterpret
something here?
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Brian D. Ripley, rip...@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, UKFax: +44 1865 272595
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] unexpected behaviour of sub() / usage of regexp
But I do get the incorrect result on R 2.14.0 on linux:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
And also:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
sub('[[:digit:]]{1,2}', '', 'ewww9')
[1] ww9
sub('\\d{1,2}', '', 'ewww9')
[1] ww9
But:
sub('\\d', '', 'ewww9')
[1] ewww
sub('\\d*', '', '9ewww')
[1] ewww
So it seems to be something about the way the curly braces are
handled, but only with certain groups:
sub('e{1,2}', '', '9ewww')
[1] 9www
sub('9{1,2}', '', '9ewww')
[1] ewww
But, as Prof. Ripley's email suggests, perl=TRUE solves the problem.
(I was trying out various combinations when it appeared in my inbox.)
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: x86_64-redhat-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
On Fri, Dec 9, 2011 at 9:25 AM, Duncan Murdoch murdoch.dun...@gmail.com wrote:
On 09/12/2011 9:20 AM, Jannis wrote:
Dear R users,
the way I understand the documentation of sub() and regexp the following
code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to
2 (maximum) digits, i.e. numbers and not the 'e' in the string. Do I
misinterpret something here?
I get your expected output of ewww running 2.14.0 or 2.14.0-patched on
Windows. So it's not a universal problem...
Duncan Murdoch
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3]
LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5]
LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=C
LC_NAME=C [9] LC_ADDRESS=C
LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Sarah Goslee
http://www.functionaldiversity.org
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] unexpected behaviour of sub() / usage of regexp
Thanks to all who replied. perl = TRUE indeed seems to fix the problem. It
would be great, however, to prevent others from stumbling in this pitfall by
fixing the issue if this is possible. But as Prof. Ripley mentioned fixing this
might be difficult/impossible so we might have to live with it.
By the way, is there an easily accessible and search able list of such bugs for
R (just for the future)?
Thanks a lot
Jannis
- Ursprüngliche Message -
Von: Sarah Goslee sarah.gos...@gmail.com
An: Duncan Murdoch murdoch.dun...@gmail.com
Cc: Jannis bt_jan...@yahoo.de; r-help@r-project.org r-help@r-project.org
Gesendet: 15:37 Freitag, 9.Dezember 2011
Betreff: Re: [R] unexpected behaviour of sub() / usage of regexp
But I do get the incorrect result on R 2.14.0 on linux:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
And also:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
sub('[[:digit:]]{1,2}', '', 'ewww9')
[1] ww9
sub('\\d{1,2}', '', 'ewww9')
[1] ww9
But:
sub('\\d', '', 'ewww9')
[1] ewww
sub('\\d*', '', '9ewww')
[1] ewww
So it seems to be something about the way the curly braces are
handled, but only with certain groups:
sub('e{1,2}', '', '9ewww')
[1] 9www
sub('9{1,2}', '', '9ewww')
[1] ewww
But, as Prof. Ripley's email suggests, perl=TRUE solves the problem.
(I was trying out various combinations when it appeared in my inbox.)
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: x86_64-redhat-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
On Fri, Dec 9, 2011 at 9:25 AM, Duncan Murdoch murdoch.dun...@gmail.com wrote:
On 09/12/2011 9:20 AM, Jannis wrote:
Dear R users,
the way I understand the documentation of sub() and regexp the following
code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to
2 (maximum) digits, i.e. numbers and not the 'e' in the string. Do I
misinterpret something here?
I get your expected output of ewww running 2.14.0 or 2.14.0-patched on
Windows. So it's not a universal problem...
Duncan Murdoch
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3]
LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5]
LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=C
LC_NAME=C [9] LC_ADDRESS=C
LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Sarah Goslee
http://www.functionaldiversity.org
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] unexpected behaviour of sub() / usage of regexp
On 09/12/2011 14:49, Jannis wrote:
Thanks to all who replied. perl = TRUE indeed seems to fix the problem. It
would be great, however, to prevent others from stumbling in this pitfall by
fixing the issue if this is possible. But as Prof. Ripley mentioned fixing this
might be difficult/impossible so we might have to live with it.
By the way, is there an easily accessible and search able list of such bugs for
R (just for the future)?
http://www.bugs.r-project.org
I'm not sure how obvious it would be that it is the same problem. I
happened to have worked on trying to solve it.
Thanks a lot
Jannis
- Ursprüngliche Message -
Von: Sarah Gosleesarah.gos...@gmail.com
An: Duncan Murdochmurdoch.dun...@gmail.com
Cc: Jannisbt_jan...@yahoo.de; r-help@r-project.orgr-help@r-project.org
Gesendet: 15:37 Freitag, 9.Dezember 2011
Betreff: Re: [R] unexpected behaviour of sub() / usage of regexp
But I do get the incorrect result on R 2.14.0 on linux:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
And also:
sub('[[:digit:]]{1,2}', '', '9ewww')
[1] www
sub('[[:digit:]]{1,2}', '', 'ewww9')
[1] ww9
sub('\\d{1,2}', '', 'ewww9')
[1] ww9
But:
sub('\\d', '', 'ewww9')
[1] ewww
sub('\\d*', '', '9ewww')
[1] ewww
So it seems to be something about the way the curly braces are
handled, but only with certain groups:
sub('e{1,2}', '', '9ewww')
[1] 9www
sub('9{1,2}', '', '9ewww')
[1] ewww
But, as Prof. Ripley's email suggests, perl=TRUE solves the problem.
(I was trying out various combinations when it appeared in my inbox.)
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: x86_64-redhat-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
On Fri, Dec 9, 2011 at 9:25 AM, Duncan Murdochmurdoch.dun...@gmail.com wrote:
On 09/12/2011 9:20 AM, Jannis wrote:
Dear R users,
the way I understand the documentation of sub() and regexp the following
code:
sub('[[:digit:]]{1,2}', '', '9ewww')
... should yield:
'ewww'
It returns, however:
'www'
Why is this the case? My code should just substitute 1 (minimum) or up to
2 (maximum) digits, i.e. numbers and not the 'e' in the string. Do I
misinterpret something here?
I get your expected output of ewww running 2.14.0 or 2.14.0-patched on
Windows. So it's not a universal problem...
Duncan Murdoch
Thanks for any ideas
Jannis
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C[3]
LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8 [5]
LC_MONETARY=en_US.UTF-8LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=C
LC_NAME=C [9] LC_ADDRESS=C
LC_TELEPHONE=C[11] LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Brian D. Ripley, rip...@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, UKFax: +44 1865 272595
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
