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Perl Arraysa Perl array is a list variable that stores scalar values, and variables can be of different types. array variables begin with @. Access array elements are read using the $ + variable name + [index value] format. 1. Creating an array1.

Process processing functions 1. Process Start functionFunction name EvalCall Syntax eval (string)The commentary considers a string as a Perl statement execution.When executed correctly, the system variable $@ is an empty string, and if there is an

Perl Common function set 2 I. Process processing functions1. Process startup FunctionFunction Name evalCall the syntax eval_r (string)The description regards string as a Perl statement execution.After the command is correctly executed, the

I. Process processing functions 1. Process startup Function Function Name eval Call the syntax eval (string) Describe the stringPerlStatement execution. After the command is correctly executed, the system variable $ @ is an empty string. If an error

Introduction to the Perl language instructions for a scalar scalar constant numeric string number and string conversion scalar variable Print output result comparison operator get user input undef value scalar context two list array list arrays note

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

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,

Summarize some of the uses of list and array operations in Perl Suppose you define an array variable @arr and assign the list (str_a, Str_b, Str_c, str_d) to the array @arr @arr = (str_a, Str_b, Str_c, str_d); Assign the number of elements in an

This article focuses on how to remove a value from an array in Perl? This article explains how to assign the elements of an array to undef, and then delete the elements from the array, and the friends you need can refer to the I'm not sure if undef

1. Using the grep functionFunction name grep Call Syntax @foundlist = grep (pattern, @searchlist); Explanation similar to the UNIX lookup tool with the same name, the grep function extracts the element in the list that matches the specified pattern,