s/<!-(-.*?-)->/ (my $x = $1) =~ tr,-,,s; $x = '--' if $x eq '-'; "<!-$
UPDATE: Fixed so it no longer turns <!----> into <!--->. Thanks to extremely for pointing that out.
UPDATE: Caveat: don't use this code on files where Perl code may be embedded in an HTML comment, as in this HTML::Mason example: <!-- <% $x-- %> -->. Thanks to extremely for pointing this out too.
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