much Ho,Ho,Ho!

When i first saw this i was concerned but didnt say anything

$html =~ s{#include file="([^"]+)"}{&add_template($1)}gei
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now remember that the htmlish command is

<!--#include file="somefolder/cc.html" -->
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and think of what is to be replaced-from in that statement .... and then think about what is left behind. Your included text is now between <!-- -->, ie html comments!

now im not great at REs, but let me suggest

$html =~ s{\<\!\-\-#include file="([^"]+)".*?\-\-\>}{&add_template($1)
+}gei
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( i escape things a lot 'cuz im never sure ....)

edit:added ? to ".*?\-\-\>, its not good to be greedy here