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!
The sum of the numbers in the vector
Length of a short side
construct matrix with identical rows
Element by element multiplication of two vectors
Sum of Two Numbers
Separate even from odd numbers in a vector - without loops
Find the largest number
Triangle of numbers
Remove the air bubbles from a vector
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