I have a string such as
fileName<-"Agg.20.20.20-all-01".
All I want to do is pull the "20.20.20" and the "all" as
strings.
Obviously, they aren't always those values.
The "20.20.20" can be "30.30.30" but it's always after
the . which is
next to the second g in Agg and it's always the same length. The all
might not always be "all" but in general it is the text between the
two
dashes.
I made an attempt using below but perl expressions and myself are an
extremely bad match ( pun was intended ) and all I got back was the same
string as
fileName in both cases.
weights=sub("^Agg.(\\.*)-\\.*$", "\1",fileName)
dashesstring=sub("^Agg.\\.*-(\\.*)-\\.*$", "\1",fileName)
I could possibly using strsplit but I'm trying to learn perl expressions
as best I can so a solution using that approach is really appreciated.
Thanks.
Will this do it:> fileName<-"Agg.20.20.20-all-01" > sub(".*\\.(\\d+\\.\\d+\\.\\d+).*", "\\1", fileName, perl=TRUE)[1] "20.20.20"> sub(".*-([^-]+)-.*", "\\1", fileName, perl=TRUE)[1] "all">On Tue, Aug 12, 2008 at 4:18 PM, <markleeds at verizon.net> wrote:> I have a string such as > > fileName<-"Agg.20.20.20-all-01". > > All I want to do is pull the "20.20.20" and the "all" as strings. > > Obviously, they aren't always those values. > > The "20.20.20" can be "30.30.30" but it's always after the . which is next > to the second g in Agg and it's always the same length. The all might not > always be "all" but in general it is the text between the two dashes. > > I made an attempt using below but perl expressions and myself are an > extremely bad match ( pun was intended ) and all I got back was the same > string as > fileName in both cases. > > weights=sub("^Agg.(\\.*)-\\.*$", "\1",fileName) > dashesstring=sub("^Agg.\\.*-(\\.*)-\\.*$", "\1",fileName) > > I could possibly using strsplit but I'm trying to learn perl expressions as > best I can so a solution using that approach is really appreciated. Thanks. > > ______________________________________________ > 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. >-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?
It can be done like this with strapply in gsubfn. See home page at http://gsubfn.googlecode.com . strapply is like apply except the string to be operated on replaces the matrix and the regexp replaces the margin number and the function can be omitted if you are only returning one item. Its like strsplit in that it returns a list of one component per input string but here we only have one string so use [[1]]. fileName <- "Agg.20.20.20-all-01" library(gsubfn) # 20.20.20 strapply(fileName, "\\d\\d[.]\\d\\d[.]\\d\\d", perl = TRUE)[[1]] # alternative - backref=-1 means only return portion in 1st (...) strapply(fileName, "[.](..[.]..[.]..)-", backref = -1)[[1]] # all strapply(fileName, "-([^-]*)-", backref = -1)[[1]] # both at once - backref=-2 means only return portion in 2 (...)'s # c says to concatenate them into a character vector strapply(fileName, "[.](..[.]..[.]..)-([^-]*)-", c, backref = -2)[[1]] On Tue, Aug 12, 2008 at 4:18 PM, <markleeds at verizon.net> wrote:> I have a string such as > > fileName<-"Agg.20.20.20-all-01". > > All I want to do is pull the "20.20.20" and the "all" as strings. > > Obviously, they aren't always those values. > > The "20.20.20" can be "30.30.30" but it's always after the . which is next > to the second g in Agg and it's always the same length. The all might not > always be "all" but in general it is the text between the two dashes. > > I made an attempt using below but perl expressions and myself are an > extremely bad match ( pun was intended ) and all I got back was the same > string as > fileName in both cases. > > weights=sub("^Agg.(\\.*)-\\.*$", "\1",fileName) > dashesstring=sub("^Agg.\\.*-(\\.*)-\\.*$", "\1",fileName) > > I could possibly using strsplit but I'm trying to learn perl expressions as > best I can so a solution using that approach is really appreciated. Thanks. > > ______________________________________________ > 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. >