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1. Error-checking - invalid regex, Out-of-bounds stuff. Do more testing.
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2. More operators - numeric specifier, character classes
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a. Make the zero-length checking more rigorous - a? does not match empty string, even though it should.
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3. Add support for zero-length matches - see https://regex101.com/r/8Ec4ue/1
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4. Fix adding concatenation operators in shunting-yard function (very janky, compares against operators individually)
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