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  1. or download this
    perl -e 'use Scalar::Util; $ref = qr//; print "$ref\n"; print Scalar::
    +Util::refaddr($ref)."\n";'
    (?-xism:)
    0
    
  2. or download this
    perl -e 'use Scalar::Util; $ref = qr//; print "$ref\n"; print Scalar::
    +Util::refaddr($ref)."\n";'
    (?-xism:)
    135576940
    
  3. or download this
    Class-Std-Utils-v0.0.3# prove t/ident.t 
    t/ident......ok    
    All tests successful.