my $match = pack 'H*', 
            '53005f00560045005200530049004f004e005f004' .
            '9004e0046004f0000000000bd04effe00000100';

open (FILE, 'foo') or die $!;
while (<FILE>) {
    print "Found: $1, $2, $3, $4\n"
        while s/$match(\S{4})(\S{4})(\S{4})(\S{4})/;
}
close FILE;

[download]
(Warning: untested code.) 

U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

In reply to Re: Searching binary data by Juerd
in thread Searching binary data by Shendal

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