Note that with a properly crafted regex, the timing difference between it and substr is pretty small; limiting the scope of bigint and using the look-ahead regex from Re^2: Print Number With Implied Decimal Point:
Rate regex substr regex2
regex 2926/s -- -78% -80%
substr 13087/s 347% -- -11%
regex2 14782/s 405% 13% --
Update: see Re^2: Print Number With Implied Decimal Point
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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