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!
Finding Perfect Squares
Split a string into chunks of specified length
Sum the numbers on the main diagonal
Create a vector
Sum of adjacent elements in a vector
Find the largest number
Separate even from odd numbers in a vector - without loops
How many Integers?
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