Reviewing this book, I am not faced with the decision whether to recommend it or not. That's not an issue. I am concerned merely with recommending this particular edition. For years Jeffrey Friedl's 'Mastering Regular Expressions' has been among the best seller lists for those using regexs. If you haven't got it and you are interested in regular expressions then go out and buy it. It really is the bible. Any of us involved with Perl, parsing html or even unix admin are going to come across regexes eventually. I find them fairly heavy going, but incredibly powerful.