(.*[\r\n]+)

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I think you need to be far more specific to tell the RE engine to skip exactly six lines. I would specifically exclude newlines in the .* part and explicitly require a newline \n to delimit a line:

([^\n]*\r?\n){6}

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In reply to Re: Regex find and replace involving new line by Corion
in thread Regex find and replace involving new line by PRA007

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