Grammar

A program is composed of a list of items

[program.syntax]

^Syntax
Program → Item^*

^Syntax
Token →
    IDENT
    | ALPHANUMERIC
    | FLOAT_LITERAL
    | STRING_LITERAL
    | INTEGER_LITERAL
    | FLOAT_LITERAL

STRING_LITERAL → " (
        ~[\ "]
        | \ <any char>
    )^{* (non-greedy)} "

IDENT → ALPHABETIC ALPHANUMERIC^*

ALPHANUMERIC → ALPHABETIC | NUMERIC

ALPHABETIC → [a-z A-Z _]

NUMERIC → [0-9]

INTEGER_LITERAL → NUMERIC⁺

FLOAT_LITERAL → NUMERIC⁺ . NUMERIC⁺