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#Note: To keep Perl from resolving "$\n" as the variable "$\"
...
  print "   m modifier (multi line mode): "
    ."regex=/$sRegex/m\n     $sMatch => $sComment\n";
}

string=<a\n>
   no modifier: regex=/^a$/
...
     no match => $ matches only boundary, \n matches first newline
   m modifier (multi line mode): regex=/^a$\n/m
     match => $ matches only boundary, \n matches first newline