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  1. or download this
    $s =~ /^$re2$/;
  2. or download this
    my $s = 'couldsomeonerecommendaworkingperlmoduletosplitconcatenatedwor
+ds';
  3. or download this
    ## $re2 = (recommend|someone|working|module|words|split|comme|could|..
+.