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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