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  1. or download this
     use strict; use warnings;

...
 my $rep = '';
 $msg =~ s/$pat/$rep/;
 print $msg, "\n";
  2. or download this
     this is a test
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     use strict; use warnings;

...
 my $rep = '';
 $msg =~ s/$pat/$rep/;
 print $msg, "\n";
  4. or download this
     a test
  5. or download this
    perl -v

This is perl, v5.8.8 built for x86_64-linux-thread-multi-ld