I just spent a day and a half debugging someone's code, only to
discover that the problem is platform dependent regular expressions.
For example:
## Windows:
grepl("\\W", "", "?") # TRUE
## OS X:
grepl("\\W", "", "?") # TRUE
## Linux:
grepl("\\W", "", "?") # FALSE
Ouch. The documentation does say "Certain named classes of characters
are predefined. Their interpretation depends on the _locale_", but
that doesn't seem to cover it given that the locale on OS X and Linux
was the same (en_US.UTF-8).
Question: Is this considered a bug, and if so what can I do to help
fix it? I've checked and the issue is present in both r-patched and
r-devel.
Best,
Ista
why 3 parameters on the 'grepl'? Did you mean to say:
?grepl("\\W", "?") # FALSE
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
On Tue, Feb 9, 2016 at 11:55 AM, Ista Zahn <istazahn at gmail.com> wrote:
> I just spent a day and a half debugging someone's code, only to
> discover that the problem is platform dependent regular expressions.
> For example:
>
> ## Windows:
> grepl("\\W", "", "?") # TRUE
>
> ## OS X:
> grepl("\\W", "", "?") # TRUE
>
> ## Linux:
> grepl("\\W", "", "?") # FALSE
>
> Ouch. The documentation does say "Certain named classes of characters
> are predefined. Their interpretation depends on the _locale_", but
> that doesn't seem to cover it given that the locale on OS X and Linux
> was the same (en_US.UTF-8).
>
> Question: Is this considered a bug, and if so what can I do to help
> fix it? I've checked and the issue is present in both r-patched and
> r-devel.
>
> Best,
> Ista
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
[[alternative HTML version deleted]]
Hi Jim,
Bah, yes, I meant,
## Windows:
grepl("\\W", "?") # TRUE
## OS X:
grepl("\\W", "?") # TRUE
## Linux:
grepl("\\W", "?") # FALSE
Sorry about that. My original example was with gsub, but I thought
changing to grepl example was clearer. Thank you.
-- Ista
On Tue, Feb 9, 2016 at 12:10 PM, jim holtman <jholtman at gmail.com>
wrote:> why 3 parameters on the 'grepl'? Did you mean to say:
>
> grepl("\\W", "?") # FALSE
>
>
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
>
> On Tue, Feb 9, 2016 at 11:55 AM, Ista Zahn <istazahn at gmail.com>
wrote:
>>
>> I just spent a day and a half debugging someone's code, only to
>> discover that the problem is platform dependent regular expressions.
>> For example:
>>
>> ## Windows:
>> grepl("\\W", "", "?") # TRUE
>>
>> ## OS X:
>> grepl("\\W", "", "?") # TRUE
>>
>> ## Linux:
>> grepl("\\W", "", "?") # FALSE
>>
>> Ouch. The documentation does say "Certain named classes of
characters
>> are predefined. Their interpretation depends on the _locale_",
but
>> that doesn't seem to cover it given that the locale on OS X and
Linux
>> was the same (en_US.UTF-8).
>>
>> Question: Is this considered a bug, and if so what can I do to help
>> fix it? I've checked and the issue is present in both r-patched and
>> r-devel.
>>
>> Best,
>> Ista
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>
>