It's a question of exactly what you want.

Precisely so. This is why (IMHO) How to ask better questions using Test::More and sample data should be one of the first posts read by all wisdom seekers. Here's a fuller set of tests building on the example of BillKSmith. It's up to flieckster to flesh out the @tests array with more exhaustive data sets.

use strict;
use warnings;

use Test::More;

my @tests = (
    { have => '"654321_1111"', want => '654321_1111' },
);

plan tests => 5 * @tests;

for my $t (@tests) {
    is billksmith  ($t->{have}), $t->{want}, 'BillKSmith';
    is syphilis    ($t->{have}), $t->{want}, 'syphilis';
    is grandfather ($t->{have}), $t->{want}, 'GrandFather';
    is rsfalse     ($t->{have}), $t->{want}, 'rsFalse';
    is hippo       ($t->{have}), $t->{want}, 'hippo';
}

sub billksmith {
    my $string = shift;
    my $regex = qr/^\"(.+)\"$/;
    my ($got) = $string =~ m/$regex/;
    return $got;
}

sub syphilis {
    my $str = shift;
    substr ($str,  0, 1, '');
    chop $str;
    return $str;
}

sub grandfather {
    my $str = shift;
    $str =~ s/^"|"$//g;
    return $str;
}

sub rsfalse {
    my $string = shift;
    for (1 .. 2) {
        $string = reverse $string;
        chop $string;
    }
    return $string;
}

sub hippo {
    my $str = shift;
    $str =~ tr/"//d;
    return $str;
}
[download]