Exercise ‹5›:

Lexical ANTLR description for financial quantities in American notation, like $**2,345.67 $12,452,183.16 $****12 $*0.124300
Note that there is a dollar sign at the beginning, optional asterisks follow, next we have a natural number without leading zeros and with a comma separating every three digits starting from the right, and finally there is an optional “.” followed by one or more digits.
Authors: Guillem Godoy (taken from Jordi Cortadella's exercise list) / Documentation:
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