This looks much (c)leaner than the REGEXP method.
while on the topic of 'undocumented trivia that will earn you a couple of cody points for no good reason', have you seen this one?
I believe this is the very first use of the Ans Hack in Cody. See http://blogs.mathworks.com/community/2016/06/23/the-great-ans-hack/
interesting use of strread to turn a string into a cell array (though probably only really useful in cody)
Kids, don't try this at home. :-)
This solution was proposed by Oleg Komarov.
Finding Perfect Squares
7 segment LED display
Getting the absolute index from a matrix
Multiples of a Number in a Given Range
Count the Digits in the Box
Cell Counting: How Many Draws?
Rotate and display numbered tile
Twist 'n' Match
Find the stride of the longest skip sequence
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