A first Example

start:        die  /^\Z/

die:          'd' number
            | number 'd' number

number:       /\d+/


In [1] := d8
Out [1] = <<MATCHED>>
In [2] := 3d4
Out [2] = <<MATCHED>>
In [3] := 8 d 12
Out [3] = <<MATCHED>>
In [4] := 45
Out [4] = <<UNDEF>>
In [5] := 4 d 
Out [5] = <<UNDEF>>
In [6] := 3d4 3d4
Out [6] = <<UNDEF>>

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