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!
Multiply a column by a row
Alternately upper-lower case
Create a Matrix of Zeros
How many Integers?
Product of Each Column
Find the starting index of a consecutive condition
Find the average of a random sequance
Find the largest number
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