my $patternreadfromfile
    = q{<h1 tag="@{[substr "$2",1,-1]}">@{[substr "$1",1,-1]}</h1>};

##</code><code>##

my $patternreadfromfile= q{do_what_i_want( $1, $2 )};

sub do_what_i_want {
    my ($one, $two) = @_;
    for ( $one, $two ) {
        s/\A.(.*).\z/$1/;
    }
    return qq{<h1 tag="$one">$two</h1>};
}

my $outpattern = $patternreadfromfile;

##</code><code>##

my $doit = sub {
    my ($one, $two) = @_;
    for ( $one, $two ) {
        s/\A.(.*).\z/$1/;
    }
    return qq{<h1 tag="$one">$two</h1>};
};
my $patternreadfromfile= q{$doit->( $1, $2 )};