Sorry juo, I misunderstood the question, here is my suggestion:

my $ohm = '24Ù 34Ã 234Æ 32Ï 23Ð 1½ 23§';
print "Before substract : $ohm\n";
while ($ohm =~ /[^!-~\s]/g)#This helps to find the non ascii character
{
    $unit=$&;
    $ohm=~s/$unit//e;
    $foo ='&#x'.sprintf("%04X",ord($unit)).";";
  print "Unit : $unit\tHex : $foo\n";
}
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In CMD, display the following hexadecimal values:

Hex : Ù
Hex : Ã
Hex : Æ
Hex : Ï
Hex : Ð
Hex : ½
Hex : §
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These hexadecimal values are viewed in IE as HTML and XML file, I am getting exact symbol which are present in the code.

Please, try this.