Hi
A while back I used gsub to do the following
temp<-"000US00231"
gsub("something here", "", temp)
"00231"
I think it involved the `meta characters' somehow.
I do not know how to do this anymore. I know strsplit will also work but I
remember gsub was much faster. In essence the question is how to delete
all characters before a particular pattern.
If anyone has some help file for this, it will be greatly appreciated.
Jean Eid
You might want to look at ?regex. Sean On Sep 23, 2004, at 10:03 AM, Jean Eid wrote:> Hi > > A while back I used gsub to do the following > > temp<-"000US00231" > gsub("something here", "", temp) > "00231" > > I think it involved the `meta characters' somehow. > > I do not know how to do this anymore. I know strsplit will also work > but I > remember gsub was much faster. In essence the question is how to > delete > all characters before a particular pattern. > > If anyone has some help file for this, it will be greatly appreciated. > > > Jean Eid > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html
Jean Eid <jeaneid <at> chass.utoronto.ca> writes:
:
: Hi
:
: A while back I used gsub to do the following
:
: temp<-"000US00231"
: gsub("something here", "", temp)
: "00231"
:
: I think it involved the `meta characters' somehow.
:
: I do not know how to do this anymore. I know strsplit will also work but I
: remember gsub was much faster. In essence the question is how to delete
: all characters before a particular pattern.
:
: If anyone has some help file for this, it will be greatly appreciated.
:
I think you want sub in this case, not gsub.
There are many possibilities here depending on what the
general case is. The following all give the desired
result for the example but their general cases differ.
These are just some of the numerous variations possible.
temp<-"000US00231"
sub(".*US", "", temp)
sub(".*S", "", temp)
sub("[[:digit:]]*[[:alpha:]]*", "", temp)
sub(".*[[:alpha:]]", "", temp)
sub(".*[[:alpha:]][[:alpha:]]", "", temp)
sub(".*[[:upper:]]", "", temp)
sub(".*[[:upper:]][[:upper:]]", "", temp)
sub(".....", "", temp)
substring(temp, 6)