If you want to remove particularly the character sequence "ÿþ", it's quite simple: 
use utf8;
                                                           
my $string = 'AÿþBÿþÿþC';
$string =~ s/ÿþ//g;
print $string;

[download]
Result: 
ABC

[download]

In reply to Re: Remove ÿþ from a string by kroach
in thread Remove ÿþ from a string by AnishaM

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