Reformatting your code shows a number of things:

foreach $_ (@array) { 
  @array2 = grep {$_ =~ "unknown type(0x134e) 30.6511 (V6.5.1 FP1)"} (
+@array); 
  print FILE "@array2"; 
  close(FILE);
[download]

• The foreach loop is not closed.
• The use of $_ in this loop might cause disruption with the $_ implied by grep. Better use $line or such.
• In the foreach loop over each element of @array you apply grep to @array. This is a duplicated loop.
• There is a file handle FILE coming out of the blue.

Could you add a couple of lines of your files, matching and non-matching, that the question becomes easier to understand?

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