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Well the plan is to use the power of regular expressions engine of AutoIT for patching binary data. Something like this: StringRegExp( $BinaryData, "(?s)\x55\x8B.." <cut> ... Okay straight to question/problem ... certain bytes that are in the range from 0x80 to 0xA0 won't match. Hmm seem to be a char encoding problem. In detail these are 27 chars: 0x80, 0x82~8C, 0x8E, 0x91~9C, 0x9E,0x9F Here's a small code snippet to explore / explain this problem: #include "StringConstants.au3" $TestData = BinaryToString("0x7E7F808182") ;Okay $match = StringRegExp( $TestData ,'\x7E' ,$STR_REGEXPARRAYFULLMATCH) ConsoleWrite('@extended = ' & @extended & ' $match = ' & $match & @CRLF) ;Okay $match = StringRegExp( $TestData ,'\x7F' ,$STR_REGEXPARRAYFULLMATCH) ConsoleWrite('@extended = ' & @extended & ' $match = ' & $match & @CRLF) ;Error no match $match = StringRegExp( $TestData ,'\x80' ,$STR_REGEXPARRAYFULLMATCH) ConsoleWrite('@extended = ' & @extended & ' $match = ' & $match & @CRLF) ;Okay $match = StringRegExp( $TestData ,'\x81' ,$STR_REGEXPARRAYFULLMATCH) ConsoleWrite('@extended = ' & @extended & ' $match = ' & $match & @CRLF) ;Error no match $match = StringRegExp( $TestData ,'\x82' ,$STR_REGEXPARRAYFULLMATCH) ConsoleWrite('@extended = ' & @extended & ' $match = ' & $match & @CRLF) ;~ output: ;~ @extended = 2 $match = ;~ @extended = 3 $match = ;~ @extended = 0 $match = 1 ;~ @extended = 5 $match = ;~ @extended = 0 $match = 1 Hmm what to do? Go back and use the 'numberstring monster' implementation or just omit that range of 'unsafe bytes'. What is the root of this problem? Any idea how to fix this? Update: Okay I know a byte is not a character. But StringRegExp operates on String and so character level. Okay as long as you stay at Ansi encoding and only use /x00 - /X7F in the search pattern using StringRegExp works well to search for binary data. What bytes can be matched that are in the range from /X7F - /xFF is also depending on the code page. So this avoid to search for bytes in the range from 0x80-0xa0 only applies to Germany. I just change this country setting: to Thai and now near all bytes from /X7F - /xFF fails to match.