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  1. or download this
    $ perl5.12.2 junk
Compiling REx "-?\p{Nd}"
...
Match failed
Doesn't match
Freeing REx: "-?\p{Nd}"
  2. or download this
    $ perl5.14.1 junk
Compiling REx "-?\p{Nd}"
...
Match successful!
Matches
Freeing REx: "-?\p{Nd}"
  3. or download this
    
$ perl5.12.2 junk
...
Match successful!
Matches
Freeing REx: "-?\p{Nd}{1}"
  4. or download this
    $ perl5.14.1 junk
Compiling REx "-?\p{Nd}{1}"
...
Match successful!
Matches
Freeing REx: "-?\p{Nd}{1}"