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!
Distance walked 2D
surface of a spherical planet
Longest run of consecutive numbers
Symmetry of vector
Approximate the cosine function
Add a vector to a matrix
Remove the air bubbles from a vector
How many days in a month?
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