It is easier to use if statement to check whether the number is in range or not.
But I'm writing an interpreter so I should use regex to check the input number using regular expressions for validating numeric ranges is not recommended.
Adobe provided a lot of infrastructure to do that with just a simple script.
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It turns out that the first approach (aliteralmind's answer) is far more economical.
Speed Tests Here is the output of my simple speed test, matching from -1M to 1M.
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