Re: [R] Regression expression to delete one or more spaces at end of string

[David R Forrest]

Double the [[]] and add a + for one-or-more characters: 

sub("[[:blank:]]+$", "", COLNAMES)



> On Aug 2, 2016, at 12:46 PM, Dennis Fisher  wrote:
> 
> R 3.3.1
> OS X
> 
> Colleagues, 
> 
> I have encountered an unexpected regex problem
> 
> I have read an Excel file into R using the readxl package.  Columns names are:
> 
> COLNAMES  <- c("Study ID", "Test and Biological Matrix", "Subject No. ", 
> "Collection Date", 
> "Collection Time", "Scheduled Time Point", "Concentration", "Concentration 
> Units", 
> "LLOQ", "ULOQ", "Comment”)
> 
> As you can see, there is a trailing space in “Subject No. “.  I would like to 
> delete that space.  The following works:
>   sub(“ $”, “”, COLNAMES)
> However, I would like a more general approach that removes any trailing 
> whitespace.
> 
> I tried variations such as:
>   sub("[:blank:]$", "", COLNAMES)
> (also, without the $ and ‘space' instead of ‘blank') without success — to my 
> surprise, characters other than the trailing space were deleted but the 
> trailing space remained.
> 
> Guidance on the correct syntax would be appreciated.
> 
> Dennis
> 
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone / Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
> 
> __
> R-help@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.

--
Dr. David Forrest
d...@vims.edu
804-684-7900w
757-968-5509h
804-413-7125c
#240 Andrews Hall
Virginia Institute of Marine Science
Route 1208, Greate Road
PO Box 1346
Gloucester Point, VA, 23062-1346










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Re: [R] Regression expression to delete one or more spaces at end of string

[William Dunlap via R-help]

First, use [[:blank:]] instead of [:blank:]. that latter matches colon, b,
l,
a, n, and k, the former whitespace.

Second, put + after [[:blank:]] to match one or more of them.

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Tue, Aug 2, 2016 at 9:46 AM, Dennis Fisher  wrote:

> R 3.3.1
> OS X
>
> Colleagues,
>
> I have encountered an unexpected regex problem
>
> I have read an Excel file into R using the readxl package.  Columns names
> are:
>
> COLNAMES<- c("Study ID", "Test and Biological Matrix", "Subject
> No. ", "Collection Date",
> "Collection Time", "Scheduled Time Point", "Concentration", "Concentration
> Units",
> "LLOQ", "ULOQ", "Comment”)
>
> As you can see, there is a trailing space in “Subject No. “.  I would like
> to delete that space.  The following works:
> sub(“ $”, “”, COLNAMES)
> However, I would like a more general approach that removes any trailing
> whitespace.
>
> I tried variations such as:
> sub("[:blank:]$", "", COLNAMES)
> (also, without the $ and ‘space' instead of ‘blank') without success — to
> my surprise, characters other than the trailing space were deleted but the
> trailing space remained.
>
> Guidance on the correct syntax would be appreciated.
>
> Dennis
>
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone / Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
>
> __
> R-help@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]]

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and provide commented, minimal, self-contained, reproducible code.

Re: [R] Regression expression to delete one or more spaces at end of string

[Marc Schwartz]

> On Aug 2, 2016, at 11:46 AM, Dennis Fisher  wrote:
> 
> R 3.3.1
> OS X
> 
> Colleagues, 
> 
> I have encountered an unexpected regex problem
> 
> I have read an Excel file into R using the readxl package.  Columns names are:
> 
> COLNAMES  <- c("Study ID", "Test and Biological Matrix", "Subject No. ", 
> "Collection Date", 
> "Collection Time", "Scheduled Time Point", "Concentration", "Concentration 
> Units", 
> "LLOQ", "ULOQ", "Comment”)
> 
> As you can see, there is a trailing space in “Subject No. “.  I would like to 
> delete that space.  The following works:
>   sub(“ $”, “”, COLNAMES)
> However, I would like a more general approach that removes any trailing 
> whitespace.
> 
> I tried variations such as:
>   sub("[:blank:]$", "", COLNAMES)
> (also, without the $ and ‘space' instead of ‘blank') without success — to my 
> surprise, characters other than the trailing space were deleted but the 
> trailing space remained.
> 
> Guidance on the correct syntax would be appreciated.
> 
> Dennis


Dennis, 

There is actually an example in ?gsub:

## trim trailing white space
str <- "Now is the time  "
sub(" +$", "", str)  ## spaces only

The '+' sign will match the preceding space one or more times at the end of the 
character string.

Note that as per ?regex, it is [:space:], not [:blank:] and the brackets need 
to be doubled in the regex to define the enclosing character group. An example 
would be:

sub("[[:space:]]+$", "", str) ## white space, POSIX-style

which is also in ?gsub.

Regards,

Marc Schwartz

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[R] Regression expression to delete one or more spaces at end of string

[Dennis Fisher]

R 3.3.1
OS X

Colleagues, 

I have encountered an unexpected regex problem

I have read an Excel file into R using the readxl package.  Columns names are:

COLNAMES<- c("Study ID", "Test and Biological Matrix", "Subject No. ", 
"Collection Date", 
"Collection Time", "Scheduled Time Point", "Concentration", "Concentration 
Units", 
"LLOQ", "ULOQ", "Comment”)

As you can see, there is a trailing space in “Subject No. “.  I would like to 
delete that space.  The following works:
sub(“ $”, “”, COLNAMES)
However, I would like a more general approach that removes any trailing 
whitespace.

I tried variations such as:
sub("[:blank:]$", "", COLNAMES)
(also, without the $ and ‘space' instead of ‘blank') without success — to my 
surprise, characters other than the trailing space were deleted but the 
trailing space remained.

Guidance on the correct syntax would be appreciated.

Dennis

Dennis Fisher MD
P < (The "P Less Than" Company)
Phone / Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com

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R-help@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.