open (FILE,"abc345.txt") or die $!;
       while (<FILE>){
       $_ = /((^Query = .*)|(^\>.*)|(Length = .*))/i;
       print $1   "\n";
       print $2  "\n";
       print $3  "\n";
       print $4 "\n";
      
   }
  close (FILE) ;

[download]
I want the result in new lines. can someone help with that ? but when i print it with new line i get an error Modification of a read-only value attempted at - line 5, <FILE> line 1. Any ideas how to fix this ?

can anybody tell me how to get just the first 4 matches for all the regex?

In reply to add new lines to output. by shaludr

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