[R] Remove leading and trailing white spaces

[Gabor Grothendieck]

See:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/40714.html

There are many packages which have this functionality as well and a
search (??, RSiteSearch, rseek.org) will find them.

The links box on the http://gsubfn.googlecode.com page has links to
regular expression pages on the web.

On Fri, Nov 20, 2009 at 10:51 AM, Bos, Roger <roger.bos at rothschild.com> wrote:
> I have a character string and I would like to remove the leading and
> tailing white spaces.  The example for 'sub' shows how to remove the
> trailing white spaces, but I still can't figure out how to remove both
> trailing and leading white spaces because I can't find any documentation
> for what "+$" means or what "\\s+$" means.  Maybe its because I don't
> have a Unix background.  Thanks in advance for any help with this.
>
> str <- '    Now is the time      '
> sub(' +$', '', str)  ## spaces only
> sub('[[:space:]]+$', '', str) ## white space, POSIX-style
> sub('\\s+$', '', str, perl = TRUE) ## Perl-style white space
>
> Thanks,
>
> Roger
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