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sub plugin_name {
   my $text_to_return = ...;
   $text_to_return =~ s{<}{<post_include>path/to/lt</post_include>}g;
   return $text_to_return;
}

my %subst = (
   '<'     => '&lab;',
...
   $text_to_return =~ s/($subst_re)/$subst{$1}/g;
   return $text_to_return;
}