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  1. or download this
    $ perl
    print '$x' =~ m'$x'
    __END__
    
    $
    
  2. or download this
      DB<8> use re 'debug'; '$a' =~ m'$a'
    Compiling REx "$a"
    ...
       2: EXACT <a> (4)
       4: END (0)
    anchored "a" at 0 (checking anchored) minlen 1