Something

print "Content-type: text/html\n\n";

open(FORM, 'config/formulario.txt') || die "No pude abrir el archivo formulario.txt: $!";
while(<FORM>){
        chomp;
        ($comentario, $tipocampo, $validacion, $nombre_en_db) = split(/:/, $_);
        push @campos, $comentario;
}
my $formulario = CGI::FormBuilder->new(
        method => 'post',
        name => 'Rodilla',
        title => 'RODILLA!!',
        fields => \@campos,
        font => 'Arial',
        submit => 'Enviar',
        );
if ($formulario->submitted && $formulario->validate){
        #&conectar_db;
        open(DB, 'config/datos_db.txt') || die "No pude abrir el archivo formulario.txt: $!";
        while(<DB>){
        chomp;
        #($dbtype, $dbname, $host, $dbuser, $dbpass) = split(/\s/, $_);
        @datos_db = split(/\s/, $_);
        }
        $db = DBI->connect("DBI:$datos_db[0]:database=$datos_db[1];host=$datos_db[2]", $datos_db[3], $datos_db[4], {RaiseError => 1});

        my (@copia, $campo);
        @campos = @copia;

        foreach $campo (@campos){
        push @copia, eval "$campo";
        }

        foreach (@campos) {
        $_ = "\"\$" . "$_\",";
        }

        my $numero = @campos;
        $numero = $numero -1;
        chop($campos[$numero]);

        print "@campos\n";
        #$query = $db->prepare("INSERT INTO formulario VALUES(\"\", @campos);");
        #$query->execute();

        #print $formulario->confirm(template => 'templates/funciona.tmpl');

}
else{
        print $formulario->render(header => 1);
}