A tag for arbitrary-precision decimal numbers.
§Valid datatypes
§Grammar
^(?<sign>[+-])?(?<integral>[0-9]+)(?:\.(?<fractional>[0-9]+))?(?:[eE](?<expsign>[+-])?(?<exp>[0-9]+))?$
Examples of valid numbers include:
1
+1
-1
001
123.456
1e2
123.456e789
123.456e+789
123.456e-789