Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Hash reference in Perl
Answer:
Hash reference is something like a pointer to a hash data structure in Perl
Example:
my %hash = (
"a" => "1",
"b" => "2",
);
my $hash_ref = \%hash;
$hash{"a"} = "A";
print $hash_ref->{"a"}; # print out "A" as change in %hash also reflected in its reference
A simple hash in Perl
Answer:
Hash is a dictionary like data structure in Perl. It allows you to direct access to a particular element inside a hash.
Example:
use strict;
use warnings;
my %hash = (
"a" => "1",
"b" => "2",
);
print $hash{"b"}; # print "2"
A simple array in Perl
Answer:
Array is a list like data structure in Perl. It allows you to access to the elements inside the array sequentially.
Example:
use strict;
use warnings;
my @a = (1, 2, 3);
print $a[2]; # print '3', since Perl array is zero-indexed
Replace Unicode character using regex with Perl
Answer:
To use regex to replace Perl's Unicode string, you can try the following.
$text =~ s/[\x{0000}-\x{007F}]+/ /g;
The above code replace all Unicode with codepoint from 0 to 127 by a space.
Multiline string in Perl
Answer:
You can either use the q operators.
my $s = q#''''"
test
"""'
#;
print $s;
Or qq operators if you need interpolation.
my $d = "test";
my $s = qq#''''"
$d
"""'
#;
print $s;
