You can also use something like "\xFF\x55\x74\xE7" to specify your "$cut" and "$place" strings
In the example below "\x00\x55" is replaced by "\x22\xFF" 

#!/usr/bin/perl

use strict;
use warnings;

sub hex2str {
    my $hex = shift;
    my @bytes = unpack('C*', $hex);
    join(' ', map {sprintf('%02X',$_)} @bytes);
}

my $bin = qq{\x34\x65\xF5\x00\x55\x34\x65\xF5\x00\x55\x77\xED};

print hex2str($bin), "\n";

$bin =~ s/\x00\x55/\x22\xFF/g;

print hex2str($bin), "\n";

[download]
Output: 
34 65 F5 00 55 34 65 F5 00 55 77 ED
34 65 F5 22 FF 34 65 F5 22 FF 77 ED

[download]

In reply to Re: binary search/replace by nif
in thread binary search/replace by momo33

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