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  1. or download this
    /([0-9]{2,})(?(?{index("0123456789", $1) == -1})(*FAIL))/
    
  2. or download this
    >perl -wMstrict -le
    "my $skip_if_not_consecutive = qr{
    ...
    "
    'a1a11a9129a912a129a112a122a34a345a'
      '34' '345'