# first, let's emulate what is showing up in the html data:

perl -e 'binmode STDOUT,":utf8"; print "\x92"' | od -txC
0000000    c2  92                                                        
0000002

# now let's see how perl handles that as input:

perl -e 'binmode STDOUT,":utf8"; print "\x92"' |
 perl -le 'binmode STDIN,":utf8"; $_=<STDIN>; print;
          binmode STDOUT,":utf8"; print' | od -txC
0000000    92  0a  c2  92  0a                                            
0000005

# perl's internal representation for "unicode" U+0080-U+00FF
# is really single bytes, and output to a non-utf8 file handle
# will be single bytes; but the utf8 flag is set, and output
# to a utf8 file handle will create "wide characters".

# Now, to do what really needs to be done in your case:

perl -e 'binmode STDOUT,":utf8"; print "\x92"' |
 perl -le 'use Encode; binmode STDIN,":utf8"; binmode STDOUT,":utf8";
  $_=<STDIN>; print;
  $_=encode("iso-8859-1",$_);
  $_=decode("cp1252",$_); print' | od -txC
0000000    c2  92  0a  e2  80  99  0a                                    
0000007

# the three byte sequence "e2 80 99" is utf8 for U+2019,
# "right single quotation mark":

perl -e 'binmode STDOUT,":utf8"; print "\x{2019}"' | od -txC
0000000    e2  80  99                                                    
0000003


##</code><code>##

tr/\x91-\x94\x96-\x98/''""--~/;