Free Perl Ebooks

Chapter 1, Introduction: Becoming a Master An introduction to the scope and intent of this book.
Chapter 2, Advanced Regular Expressions More regular expression features, including global matches, lookarounds, readable regexes, and regex debugging.
Chapter 3, Secure Programming Techniques Avoid some common programing problems with the techniques in this chapter, which covers taint checking and gotchas.
Chapter 4, Debugging Perl. A little bit about the Perl debugger,

Here is the outline of tha chapters:

Chapter 1 and 2 introduce you to regular expressions and give some basic regex examples. Mail utility and date matching is two of them.

Chapter 3 mostly talks about conventions that all the regex tools follow and their differences.