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Remove leading and trailing white spaces
3 messages · Bos, Roger, jim holtman, Gabor Grothendieck
try this:
x <- ' middle of the string '
sub("^[[:space:]]*(.*?)[[:space:]]*$", "\\1", x, perl=TRUE)
[1] "middle of the string"
On Fri, Nov 20, 2009 at 10:51 AM, Bos, Roger <roger.bos at rothschild.com> wrote:
I have a character string and I would like to remove the leading and
tailing white spaces. ?The example for 'sub' shows how to remove the
trailing white spaces, but I still can't figure out how to remove both
trailing and leading white spaces because I can't find any documentation
for what "+$" 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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Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?
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
***************************************************************
This message is for the named person's use only. It may\...{{dropped:23}}
______________________________________________ R-help at 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.