Hans W Borchers <hwborchers <at> googlemail.com> writes: > Sorry, my fault. I forgot the brackets. With
gregexpr("(.)(?=.\\1)", "ababacababab", perl = TRUE) it works as you suggested. Thanks Hans Werner ______________________________________________ R-help@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.