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This article will explain in detail how to perform Perl content analysis. The quality of the article content is high, so Xiaobian shares it with you for reference. I hope you have a certain understanding of relevant knowledge after reading this article.

Perl is a programming language designed by Larry Wall and constantly updated and maintained by him, and Perl runs on most operating systems and can be easily migrated to different operating systems.

Introduction to Perl

basic information

Perl was originally designed by Larry Wall and published on December 18, 1987. Perl borrows features from C, sed, awk, shellscripting, and many other programming languages.

Perl is commonly referred to as the Practical Extraction and Report Language, although it is sometimes referred to as the Pathologically Eclectic Garbage Lister. It's a term, not just a shorthand, that Perl's creator, Larry Wall, proposed *** but soon expanded to a second. That's why "Perl" doesn't have all its letters capitalized. There's no need to argue about which is right, Larry agrees with both.

You may also see "perl," all letters in lowercase. In general,"Perl," with a capital P, refers to the language itself, while "perl," with a lower P, refers to the interpreter that the program runs on.

Perl's official website is http://www. perl. org.

What is Perl?

Perl is a programming language designed by Larry Wall, and continually updated and maintained by him.

Perl has the power and flexibility of high-level languages such as C. In fact, as you will see, many of its features are borrowed from C.

. Like scripting languages, Perl doesn't need compilers and linkers to run code; all you have to do is write the program and tell Perl to run it. This means Perl is ideal for quick solutions to small programming problems and for creating prototypes for large events to test potential solutions.

Perl provides all the functionality of scripting languages such as sed and awk, but also has many features they do not have. Perl also supports sed to Perl and awk to Perl translators.

In short, Perl is as powerful as C and as convenient as script description languages such as awk and sed.

Features of Perl

Perl interpreter is open source free software, use Perl do not have to worry about the cost. Perl runs on most operating systems and can be easily migrated to different operating systems.

Perl is a language that gets things done. From the beginning, Perl was designed to simplify simple tasks without losing the ability to tackle difficult problems. It can easily manipulate numbers, text, files and directories, computers and networks, especially program languages. The language should be easy to run external programs and scan the output of those programs for things of interest. And it should be easy to pass on the things you're interested in to other programs for special processing. Of course, the language should also be easily portable to compile and run on any modern operating system.

Perl basic syntax

Variable definition, starting with the $sign, such as: $num=1;

array definition, starting with @, e.g.@array=(1,2,3);

Array element calls $array[index], where index represents the array index, as in the example above, the value of $array[0] is 1

Hash definition, starting with %, e.g.%hash=("a",1,"b",2);

Hash calls %hash, where keys represent key values, often represented by strings, such as "a","b",vaules are the corresponding values of keys, such as 1, 2 $. The value of hash{"b"} is 2.

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