Master intermediate to advanced techniques of the Perl programming language starting with a focus on regular expressions and some of their advanced features. This book then covers other pro-level features, including formatted output, file handling, and more.  
Additionally, you'll learn and explore the most useful built-in variables, pragmas, and modules available in the Perl language. Furthermore, you'll work with geometry managers and get a thorough treatment of graphical user interface development using Perl/TK and widgets. Lastly, you’ll cover debugging techniques.  
Pro Perl Programming is a professional-level reference guide on Perl and includes important aspects of it that you need as a professional programmer.   
What You Will Learn

• Program regular expressions including atoms, smartmatch operators, and more
Use advanced features such as HiRes Time, slurp() functions, Critic, Tidy and many more functions
• Handle advanced formatted output such as printf and sprintf
Explore useful built-in variables, including status variables, separator variables, and the signal handle variable
• Explore and use Perl's built-in modules, including the Pragma modules
Work with Perl/TK and its widgets-like geometry managers, frames, labels, buttons, check buttons, radio buttons, scrollbars, scales, entries, and menus

Who This Book Is For 
Those with at least some prior experience with Perl programming or have read Beginning Perl Programming by William Rothwell.