See the test suite of http://www.mathworks.co.uk/matlabcentral/cody/problems/2513 for an example of how to make sure regexp and other functions are not used.
Thanks for the tip, modified the test suite and updated the problem description to include regexpi in the list of illegal functions.
Modified the test suite again, sorry if it affects your solution.
Connect Four Win Checker
Matrix indexing with two vectors of indices
Matrix with different incremental runs
Relative ratio of "1" in binary number
Are you in XY plane?
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