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!
Increment a number, given its digits
Back to basics 14 - Keywords
Multiply a column by a row
Rotate input square matrix 90 degrees CCW without rot90
Triangle of numbers
Find the average of a random sequance
Product of Each Column
Approximate the cosine function
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