This book is not a collection of clever tricks, but a way of thinking about Perl programming so you can integrate real-life problem of debugging, maintenance, configuration, and other tasks you encounter as a working programmer. This book explains how to: Use advanced regular expressions, including global matches, lookarounds, readable regexes, and regex debugging Avoid common programming problems with secure programming techniques Profile and benchmark Perl to find out where to focus your improvements fight Perl code to make it more presentable and readable See how Perl variables to track the package and how you can use some powerful tricks Define subroutines on the fly and turn the tables on normal procedural programming. Modify and jury rig modules to fix code without editing the original source Let your users configure your programs without touching the code Learn how you can detect errors Perl does not report, and how to notify users about them Let your Perl program talk back to you by using Log4perl data Store for use in other programs, then run the same program, or to send them via network Write programs as modules to benefit from the distribution of Perl and the means of testing the Appendix include "brian's Guide to Overcoming Any Perl Problem" to improve your skills to overcome problems, and suggested reading to continue your Perl education.