By brian d foy
This is the 3rd in O'Reilly's sequence of landmark Perl tutorials, which began with Learning Perl, the bestselling advent that taught you the fundamentals of Perl syntax, and Intermediate Perl, which taught you the way to create re-usable Perl software program. Mastering Perl pulls every little thing jointly to teach you the way to bend Perl in your will. It convey's Perl's particular types and programming idioms.
This booklet isn't a set of shrewdpermanent methods, yet a fashion of puzzling over Perl programming so that you can combine the real-life difficulties of debugging, upkeep, configuration, and different projects you stumble upon as a operating programmer.
The publication explains the right way to:
* Use complicated typical expressions, together with worldwide suits, lookarounds, readable regexes, and regex debugging
* steer clear of universal programing issues of safe programming techniques
* Profile and benchmark Perl to determine the place to concentration your improvements
* Wrangle Perl code to make it extra presentable and readable
* See how Perl retains tune of package deal variables and the way you should use that for a few robust tricks
* outline subroutines at the fly and switch the tables on basic procedural programming.
* adjust and jury rig modules to mend code with out enhancing the unique source
* permit your clients configure your courses with no touching the code
* find out how you could discover mistakes Perl doesn't document, and the way to inform clients approximately them
* allow your Perl application speak again to you by utilizing Log4perl
* shop facts for later use in one other application, a later run of a similar software, or to ship them over a network
* Write courses as modules to get the advantage of Perl's distribution and checking out tools
Appendices contain "brian's advisor to fixing Any Perl Problem" to enhance your troubleshooting talents, in addition to urged interpreting to proceed your Perl schooling. Mastering Perl begins you in your route to changing into the individual with the solutions, and, failing that, the individual that understands how to define the solutions or notice the matter.
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Extra resources for Mastering Perl
Users can set that to anything they like before they run my program, and I’ve allowed outside data to influence the working of the program. pl line 3. If I use the perl command directly, it doesn’t get the switches on the shebang line in time to turn on taint checking. Since taint checking applies to the entire program, perl needs to know about it very early to make it work. When I run the program, I get a fatal error. The exact message depends on your version of perl, and I show two of them here.
Discount nothing while debugging! * My best bet in debugging is to think that I’m the problem. ” When I suspect myself first, I’m usually right. Appendix B is my guide to solving any problem, which people have found useful for at least figuring out what might be wrong even if they can’t fix it. The Best Debugger in the World No matter how many different debugger applications or integrated development environments I use, I still find that plain ol’ print is my best debugger. † I put braces around the variable so I can see any leading or trailing whitespace: print "The value of var before is [$var]\n"; #...
Summary This chapter covered some of the more useful advanced features of Perl’s regex engine. The qr() quoting operator lets me compile a regex for later and gives it back to me as a reference. ) sequences, I can make my regular expression much more powerful, as well as less complicated. The \G anchor allows me to anchor the next match where the last one left off, and using the /c flag, I can try several possibilities without resetting the match position if one of them fails. Further Reading perlre is the documentation for Perl regexes, and perlretut gives a regex tutorial.