#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

$_ = 'abacad';

say "/a(.)/";
if (/a(.)/g) {
    say "\$1: $1";
    say "\$&: $&";
} else {
    say 'No match';
}

for my $try (1 .. 3) {
    say "//";
    if (//g) {
        say "\$1: $1";
        say "\$&: $&";
    } else {
        say 'No match';
    }
}

##</code><code>##

/a(.)/
$1: b
$&: ab
//
$1: c
$&: ac
//
$1: d
$&: ad
//
No match

##</code><code>##

#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my $x = 'found 11';
my $y = 'found 12';

if ($x =~ /found (\d+)/ && $y =~ //) {  # No need to repeat the long regex! Yay!
    say "Found $1.";
}