I found this book fantastic. It opened my eyes to the 'real world' of regular expressions, that I never knew before.

This book gave me all the knowledge I needed about how the perl regex engine performs its pattern matching. How to write accurate and effective regexes.

I often manipulate text files hundreds of megabytes in size, and this book was a great lesson in how I could optimize the regexes I was using. Even so much as tripling their processing speeds!

Thanks Jeff!