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Wonderful Mate. Very neatly written.
I understood it while debugging it myself but will be great for others if you could add few comments as well around the conditions so that its more easier to understand for everyone.
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You can simply use the Number function to convert a string in scientific notation to a number
Number("123e1") === 1230
For converting number to string for big numbers, you can use:
// https://stackoverflow.com/a/50978675
myNumb.toLocaleString('fullwide', { useGrouping: false })
Here's a snippet:
const strings = ["1e+21","123E1","123e+1","123.e+1","...
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This code is a decent start, as it uses ES6 features like arrow functions. However it could take advantage of many Javascript features - e.g. IsExpenseItemAcceptable could be reduced to a single line using Array.includes(). Additionally, the index variables can be eliminated using the ES6 feature Destructuring assignment - specifically array destructuring.
...
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#ifndef LRUTIL_H
This doesn't match the name of the file. If your compiler supports #pragma once, it's easier to use that instead of manual header guards.
template <std::size_t RHS_SIZE, std::size_t LA_SIZE>
bool LR1Item<RHS_SIZE, LA_SIZE>::is_final_item() const { ...
Definitions for template functions should be in the header file, not in a ...
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