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#[regex(r"[+-]?\.[0-9][0-9_]*e[+-]?[0-9_]+", parse_float)]
#[regex(r"[+-]?[0-9][0-9_]*e\-[0-9_]+", parse_float)] // Negative exponent
#[regex(r"[+-]?\.[0-9][0-9_]*[eE][+-]?[0-9_]+", parse_float)]
#[regex(r"[+-]?[0-9][0-9_]*[eE]\-[0-9_]+", parse_float)] // Negative exponent