Hi, I am stuck on this: how to specify a match pattern that means not to include "abc"?
I tried: grep("^(abc)", "hello", value=T) should return "hello". while grep("^(abc)", "hello abcd foo", value=T) should return character(0). But both returned character(0). Thanks John [[alternative HTML version deleted]] ______________________________________________ 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.