I have cluster of 10 folders, each with 1000 program files. I need to search these text files for a string. All files must start with $O123456.MIN% (123456 bearing random file names). I know how to find if the string exists, but how do I identify if the string does not exist?
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Try this regex:
(?!(\$O[^\s]+\.MIN%)).*
It matches every string except of the form a $
followed by a O
followed by 1 or more characters except whitespace
followed by a .
followed by MIN%

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This is close, but it returns all rows in the file (1000+). And if ran againsts 1000 files, it seems to hang. The string I want to identify if it is NOT there, is always the first line. – user1987121 Jan 17 '13 at 13:32