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string.find

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I have a Lua function that includes:
 local s = string.find(buffer, ff)
The ff is defined as 0x0C (a form feed), and is a "special character". The
find is "finding" form feeds where there are none (as verified with a hex
editor). Is there a problem in using this string function for finding
special characters? If so, how do I search buffer for a form feed?
 

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