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!
Which values occur exactly three times?
Replace May with April
Implement simple rotation cypher
Area of rhombus
Side of a rhombus
How many unique Pythagorean triples?
How many days in a month?
Find the average of a random sequance
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