$ perl html.entities.pl
Unmatched [ in regex; marked by <-- HERE in m/([ <-- HERE / at (eval 1) line 2.
 while trying to turn range: "/
"
 into code: sub {$_[0] =~ s/([/
])/$char2entity{$1} || num_entity($1)/ge; }
  at /usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi/HTML/Entities.pm line 428.