jan goyvaerts book is solid
i got my copy of jan goyvaerts' "Regular Expressions - The Complete Tutorial" today. not bad at all. again, since i'm a relative n00b when it comes to regex, the pace in this book fits me just fine. however, if you're a serious geek with powerful binary biceps, this text will proly bore you.
jan has a solid web site on regex in general as well as a site where he sells his RegexBuddy software. despite the cheesy name, i like the software nad have been using it consistently over the last several days as i dig deeper into regex in general.