I didn't realize you could use that function with non-digits in your string. Suddenly, this problem is a whole lot easier. :-)
Finding Perfect Squares
Maximum running product for a string of numbers
Get the length of a given vector
Rotate input square matrix 90 degrees CCW without rot90
The sum of the numbers in the vector
Circular Primes (based on Project Euler, problem 35)
Sums of Multiple Pairs of Triangular Numbers
Piecewise linear interpolation
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