/Localised Amount Parser()
Single Use Parser()
Allows parsers that should only run a single time, and that should not repeatedly re-parse their own output.
This method is optional. Parsers that don't implement it are not considered to be single-use parsers by default.
Parses an amount containing a thousands, millions or billions token into a number.
If the amount does not match, then null is returned.
|thousands||the token representing thousands (defaults to K)||millions||the token representing millions (defaults to M)||billions||the token representing billions (defaults to B)|
the amount with tokens
the numeric amount, or null if the value was not recognized.