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Re: What does it mean "$_." in PERL

by nvivek (Vicar)
on Aug 25, 2010 at 05:51 UTC ( [id://857080]=note: print w/replies, xml ) Need Help??


in reply to What does it mean "$_." in PERL

$_ is a special variable which contains the value of the last matched expression or the intermediate value in loops such as for, while, etc.,if you don't store that matched expression into explicit variables.

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Re^2: What does it mean "$_." in PERL
by CountZero (Bishop) on Aug 25, 2010 at 15:58 UTC
    $_ is a special variable which contains the value of the last matched expression
    Interesting, where did you get that?

    Consider and meditate on the following:

    use strict;
use warnings;
use 5.012;

my $string = 'This is a string';
my $match = $string =~ m/string/;

say $match;
say $_;

    [download]
    Wich outputs:
    1

    [download]
    And the following warning:
    Use of uninitialized value $_ in say at C:\Data\strawberry-perl\perl\s
+cript-chrome\Perl-1.pl line 9.

    [download]

    CountZero

    A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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