Several issues with this. Here are a few hints:

• The first arg (file handle) for for open is usually bare (no $)
• Your search is made for a plain text file, not binary data.
• Your regular expression is way off (no offence): "\F", "F" and the 16 counts of strings of any length
• 16 FF's would be 'FF' x 16 ... if you were going for a text string rather than binary data

You should review common "regular expressions" and then searching binary data in particular.

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