By James Lee

This is a publication for these folks who believed that we didn’t have to study Perl, and now we all know it truly is extra ubiquitous than ever. Perl is very versatile and robust, and it isn’t petrified of internet 2.0 or the cloud. initially touted because the duct tape of the net, Perl has given that developed right into a multipurpose, multiplatform language current completely all over the place: heavy-duty internet purposes, the cloud, platforms management, normal language processing, and monetary engineering. Beginning Perl, 3rd Edition offers worthy perception into Perl’s position relating to all of those initiatives and more.

Commencing with a accomplished review of language fundamentals, you’ll examine all approximately vital strategies comparable to Perl’s facts forms and keep an eye on stream constructs. This fabric units the level for a dialogue of extra advanced issues, similar to writing customized features, utilizing usual expressions, and dossier enter and output. subsequent, the e-book strikes directly to the complex themes of object-oriented programming, modules, internet programming, and database management with Perl’s strong database interface module, DBI. The examples and code supplied provide you with all the details you must begin writing your personal robust scripts to resolve the issues indexed above, and plenty of more.

Whether you're a entire beginner or an skilled programmer, Beginning Perl, 3rd Edition bargains a fantastic advisor to studying Perl.

Show description

Read or Download Beginning Perl (Expert's Voice in Open Source) PDF

Best Programming books

Embedded C

For those who are approximately to write down their first embedded application - or were suffering to benefit approximately this significant sector - this booklet will retailer weeks of attempt.

Cocoa Design Patterns

“Next time a few child exhibits up at my door soliciting for a code assessment, this is often the ebook that i'm going to throw at him. ”   –Aaron Hillegass, founding father of great Nerd Ranch, Inc. , and writer of Cocoa Programming for Mac OS X   Unlocking the secrets and techniques of Cocoa and Its Object-Oriented Frameworks   Mac and iPhone builders are frequently crushed via the breadth and class of the Cocoa frameworks.

C++ Primer (5th Edition)

Bestselling Programming educational and Reference thoroughly Rewritten for the recent C++11 usual   totally up to date and recast for the newly published C++11 average, this authoritative and entire advent to C++ might help you to profit the language quickly, and to take advantage of it in smooth, powerful methods.

Operating System Concepts

Hold speed with the fast-developing global of working platforms Open-source working platforms, digital machines, and clustered computing are one of the major fields of working structures and networking which are speedily altering. With large revisions and organizational alterations, Silberschatz, Galvin, and Gagne’s working approach options, 8th variation continues to be as present and suitable as ever, assisting you grasp the elemental ideas of working platforms whereas getting ready your self for today’s rising advancements.

Additional resources for Beginning Perl (Expert's Voice in Open Source)

Show sample text content

So why aren’t they simply known as “search styles” or whatever much less vague? the particular word itself originates from the mid-fifties while a mathematician named Stephen Kleene built a notation for manipulating ordinary units. Perl’s commonplace expressions have grown a long way past the unique notation and feature considerably prolonged the unique approach, yet a few of Kleene’s notation continues to be and the identify has caught. styles background lesson apart, average expressions are all approximately picking out styles in textual content. So what constitutes a development? and the way do you examine it opposed to whatever? the easiest development is a word—a uncomplicated series of characters—and we may well, for instance, are looking to ask Perl even if a undeniable string includes that notice. we will be able to cut up the string into separate phrases, after which try to determine if every one observe is the only we’re trying to find. Here’s how we'd do this: #! /usr/bin/perl # match1. pl use warnings; use strict; my $found = zero; $_ = "Nobody desires to harm you... 'cept, I do harm humans occasionally, Case. "; my $sought = "people"; foreach my $word (split) { if ($word eq $sought) { $found = 1; final; } } if ($found) { print "Hooray! stumbled on the be aware 'people'\n"; } yes adequate this system returns good fortune . . . $ perl match1. pl Hooray! came upon the observe 'people' $ yet oh, that’s messy! It’s complex, and it’s sluggish as well! Worse nonetheless, the split()function, which breaks up each one line right into a record of “words,” really retains the entire punctuation. (We’ll see extra approximately split()later within the bankruptcy. ) So the string “you” wouldn’t be present in the previous instance, yet “you . . . ” may. this can be having a look like a difficult challenge, however it may be effortless. Perl used to be designed to make effortless issues effortless and tough issues attainable, so there may be a greater solution to do that. Let’s see the way it appears to be like utilizing a typical expression: #! /usr/bin/perl # match2. pl use warnings; use strict; $_ = "Nobody desires to harm you... 'cept, I do harm humans occasionally, Case. "; 154 CHAPTER 7 ■ normal EXPRESSIONS if ($_ =~ /people/) { print "Hooray! stumbled on the note 'people'\n"; } a lot, a lot more straightforward, and an analogous outcome. We position the textual content we wish to locate among ahead slashes—that’s the typical expression half; that’s our development, what we’re attempting to fit. We additionally have to inform Perl during which specific string to appear for that development, and we accomplish that with the =~ operator. This operator returns 1 if the development fit was once winning (in our case, no matter if the nature series “people” was once present in the string) and the empty string if it wasn’t. sooner than we stream directly to extra complex styles, let’s simply have a brief examine that syntax. As we now have famous formerly, loads of Perl’s operations take $_ as a default argument, and standard expressions are between these operations. given that now we have the textual content we wish to try out in $_, we don’t have to use the =~ operator to “bind” the trend to a different string. lets write the code much more easily: $_ = "Nobody desires to damage you... 'cept, I do harm humans occasionally, Case. "; if (/people/) { print "Hooray! stumbled on the be aware 'people'\n"; } however, we would are looking to attempt for the trend now not matching—for the observe no longer being chanced on.

Rated 4.09 of 5 – based on 28 votes