Question : Ruby - Match/No Match

Hello
I want to select rows which match certain words - e.g. plan,Secret,secret - I think my script does that. Example output ......
row2, 1235, the plan is to xtract some Secret code from free text
row4, 1237, the plann is to extract some code from free text
row5, 1238, the idea is to extract some secret code from freeBY text
However, let's say from the rows returned I do not want any rows that have the word
freeBY (UPPER or lowercase) so my final output would be ....
row2, 1235, the plan is to xtract some Secret code from free text
row4, 1237, the plann is to extract some code from free text

Hope this makes sense

Code Snippet:

         
             File.foreach("c:/file.txt"){|line|
  if line =~/(plan.........)|([S]ecre........)|([s]ecre........)/  then   
        puts line
         end 
}

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Question : Ruby - Match/No Match

Answer : Ruby - Match/No Match

unless line =~/freeby/i or line =~/extract/i then