Double the [[]] and add a + for one-or-more characters:
sub("[[:blank:]]+$", "", COLNAMES)
> On Aug 2, 2016, at 12:46 PM, Dennis Fisher <fis...@plessthan.com> 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
>
> ______________________________________________
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--
Dr. David Forrest
d...@vims.edu
804-684-7900w
757-968-5509h
804-413-7125c
#240 Andrews Hall
Virginia Institute of Marine Science
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PO Box 1346
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