Sorry, I wasn't finish when I mistakely posted it.

I tested
          i=0
          line.scan(fkey){|x|i=i+1}
          puts i
          if i> 0
            puts "Found match...\n\r"
          end

in other file by assgined fkey and line. it worked

but the function itself couldn't find match at all. I have no idea 
what's wrong with it. Is there anyone can help me out? Thanks a lot
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