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This section has shown you how to use the regex debugging facilities built into Perl and the Perl debugger. You’ve learned how to view the usually voluminous output and how to interpret the data provided. There is a great deal of support here (usually overlooked by the average programmer) that we hope this chapter has clued you into.

For further ideas on debugging regexes in Perl check out the following perldoc references:

The next chapter offers an introduction to the customizing of the debugger, either by using the available commands and options, or by replacing the entire library itself.

In this chapter you have learned how to customize the Perl debugger, from using the alias command to changing the depth of a hash dump using HashDepth. You also learned to modify the DB::DB subroutine and replace the entire PERL5DB debugger library itself.

In the next chapter, you will learn various approaches for optimizing your Perl program. You will read about several performance hints and tips, which could be useful to make your Perl program go faster.

In this chapter you have learned various methods for finding out what exactly your code is doing, where it’s dragging its feet, and how to improve it’s response time.

You have learned how to benchmark and profile your code, and how to optimize and refactor it to improve the runtime. Finally, you learned how to inspect your code for strange or nonoptimal programming constructs, using the frontend O and backend B modules, which provide access to the Perl internals.

The next chapter offers a complete reference listing of all commands, options, and variables available within the Perl debugger, including both environment and internal debugger variables.

In this chapter you have been presented with the wide variety of options available to you if you wish to use either a GUI debugger or IDE with an embedded debugger, instead of the standard command line debugger interface. There are many possibilities, and the one you should choose depends on the operating system you are running, your personal preferences for Tk solutions over Windows solutions, and how much money or time you wish to spend.

The next chapter offers a complete command reference for all commands, variables, and options supported by the debugger.

This reference chapter has described every command, option and public DB:: variable provided by the Perl debugger. You will be able to use any of these tools to control your program’s execution, study its behavior, and inspect or change any data during the runtime of the program. Finally, you learned how to call the debugger in several different cases, depending on the context required.

There are many other references available, though some online ones are more transient than others. If we haven’t included them here, it’s because we haven’t come across them ourselves yet, or felt that the books we mentioned in this chapter covered the ground sufficiently.

We would of course like to hear of any particularly good books, or permanent URLs, that we may have inadvertently overlooked. Please contact the authors or use the Perl debugger web site or mailing list.