Additional test cases have been added.
nice internal reference to the match.
a simple improvement could be to parse "s" as input and write "lower($0(2:..." in the replacement string.
two steps in one op, nicely done!
Determine if input is odd
Number of 1s in a binary string
Replace every 3rd element in a vector with 4
Create a Matrix of Zeros
Triangle of numbers
Add a vector to a matrix
How many unique Pythagorean triples?
Sum of adjacent elements in a vector
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