On 18 Aug 2005 at 21:17, Peter Dalgaard wrote: > Dirk Eddelbuettel <[EMAIL PROTECTED]> writes: > > > Bernd Weiss <bernd.weiss <at> uni-koeln.de> writes: > > > I am struggling with the use of regular expression. I got > > > > > > > as.character(test$sample.id) > > > [1] "1.11" "10.11" "11.11" "113.31" "114.2" "114.3" "114.8" > > > > > > > > > and need > > > > > > [1] "11" "11" "11" "31" "2" "3" "8" > > > > > > I.e. remove everything before the "." . > > > > Define the dot as the hard separator, and allow for multiple digits > > before it: > > > > > sample.id <- c("1.11", "10.11", "11.11", "113.31", "114.2", > > > "114.3", "114.8") gsub("^[0-9]*\.", "", sample.id) > > [1] "11" "11" "11" "31" "2" "3" "8" > > Or, more longwinded, but with less assumptions about what goes before > the dot: > > > gsub("^.*\\.(.*)$","\\1",sample.id) > [1] "11" "11" "11" "31" "2" "3" "8"
Wow, thanks a lot for all the valuable suggestions. Bernd ______________________________________________ R-help@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