what is in perl

I used the Perl language a few days ago and mainly looked at regular expressions in Perl. In various web languages, regular expressions are very useful when processing strings, so here we will briefly talk about the application of regular

Recently, in csdn CGI, we have seen centuries (burning the sun) Users asking how to embed HTML in Perl. This is a common problem in Perl web development, hope to help you. Question I now have an HTML webpage code. I want to change it to

Network programming is a mysterious and complex art, and of course it is also very interesting. The PERL language provides a wide range of TCP/IP network functions, all of which are directly derived from the C language socket library

List module for columns in Perl, and list module for perl tools There are some modules specifically used in Perl to Process List data, such as List: Util module. This module is included in the standard library and provides various efficient common

There are three methods to use shell commands in Perl: System Functions '' QX {} First, the system function format is as follows: System ("command "); If the command runs normally, 0 is returned; otherwise, a non-zero value is

Use signal (signal) Instances in perl This article mainly introduces the use of signal (signal) Instances in perl. This article describes signal-related knowledge and provides perl code examples. For more information, see Using signal can enrich

How to delete a value from an array in Perl This article mainly introduces how to delete a value from an array in Perl? This article explains how to assign an array element to undef and then delete the element from the array. For more information,

v\:* {behavior:url(#default#VML);}o\:* {behavior:url(#default#VML);}w\:* {behavior:url(#default#VML);}.shape {behavior:url(#default#VML);} Normal 0 false 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE

The length of the Perl array and the number of elements $ #数组名---represents the subscript of the last element in the array, which equals the number of elements minus 1. The @ array name---Represents the number of elements in the array. $ scalar

This article mainly introduces the single-line annotation and multiline annotation syntax in Perl, and also explains the single-line annotation and multiline annotation syntax of other common programming languages, and the friends who need it can

1.undef UNDEF is the default value when variables are not initialized in Perl. When this uninitialized variable is used as an integer, then undef is 0, and when the variable is used as a string, then Undef is an empty string. So when you use a

The famous Schwartzian conversion in Perl, whose background mainly involves sorting problems: For example, sort alphabetically by file name, with the following code: Copy CodeThe code is as follows: Use strict; Use warnings; My @files = Glob

The array element in Perl starts with a reference ordinal of 0, the first element of the @array is $array[0], increments sequentially, and the last element is $array[-1] or $ #array. If you want to delete an existing element in an array, you can do

In Perl there are several ways to use the handle, where open is the most basic use of the method, the following I encountered the use of several handles to make a small summary:Use of the Open method:The Open method is the most basic opening file

I. Introduction of the ModuleModule is the Perl package. The Perl object is based on a reference to the data item in the package.When you use object-oriented programming in other languages, you declare a class and then create an object (instance) of

We often use a program in Linux to add parameters. Now let's take a look at the functions related to control parameters in Perl. getopt. in Linux, there are two types of parameters. one is-help and the other is-H. that is, the difference between-and.

Capture warning information and exception information in Perl and write logs This article describes how to capture warning information, exception information, and write logs in Perl, this article provides practical examples of capturing warnings-not

I have been learning the perl language recently. The following describes how to use powerful grep functions in perl programming. 1. Grep FunctionGrep has two expressions: 1 grep BLOCK LIST2 grep EXPR, LIST   BLOCKIndicates a code block, usually

Thanks to aka and the author. Regular Expressions in PerlThree forms of regular expressions Common patterns in regular expressions The 8 major principles of regular expressions Regular expressions are a major feature of the Perl language and a

I. Definition Functions can be divided into system functions and user functions. A subroutine is a separate piece of code that performs a special task, which makes it easy to reduce duplicate code and make the program readable. In Perl, subroutines