+our $Float_hex = qr{(?i:0x[0-9a-f]+p-?[0-9]+[fl]?)};
+our $Float_dec = qr{(?i:((?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?))};
+our $Float_int = qr{(?i:[0-9]+e-?[0-9]+[fl]?)};
+our $Float = qr{$Float_hex|$Float_dec|$Float_int};
+our $Constant = qr{(?:$Float|(?i:(?:0x[0-9a-f]+|[0-9]+)[ul]*))};