> I don't think anyone has mentioned the references given on the help page > ?regexp: they are a great deal more reliable than some of the third-party > write-ups that have been mentioned.
They are good technical references, but I don't think they're very helpful for someone trying to learn regular expressions. For example, mastering regular expressions takes a very task based approach which is helpful if you want to learn how to match an email address or url correctly with a regular expression (harder than most people think), or to match paired brackets. Hadley -- http://had.co.nz/ ______________________________________________ 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.
