Modify(regex) content/body before output

Hi,
I'm trying to perform a regexp on body/content just before outputing it. I tried using filter in Base.mc

<%around handle>
<% sub { $_[0] =~ s/old_value/new_value/gsi; return $_[0];} { %>
% $self->$orig();
</%>
</%around>

but it doesn't affect code blocks inside Defer methods.
I also tried to use it in Base.mp, but i don't know how to extract body variable

around 'handle' => sub {
    my ($orig, $class, $args) = @_;
    return $class->$orig($args);
};



------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot