RegExp for Luau

A regular expression library for Luau. Adapted from a regex implementation by github user Blockzez (https://github.com/Blockzez).

API

Create a regex with the new function:
RegExp.new(pattern: string, flags: string) -> RegularExpression

A resulting RegularExpression has the following methods:
* RegularExpression:exec(str: string) -> Match
* RegularExpression:test(str: string) -> boolean

The Match object resulting from exec has the following fields:
* [1..n] - The array potion of the Match object contains captured groups
* n - The length of the array of resulting captured groups
* index - The index in the original string where the match begins
* input - The original string passed into exec

$3

The following flags can be provided via the second argument to RegExp.new:
* "i" - ignoreCase
* "g" - global
* "m" - multiline