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.
vectorization in N
Convert a numerical matrix into a cell array of strings
CONVERT TAN TO SIN
Back to basics - mean of corner elements of a matrix
Delete 2nd and 5th column of Given 6*6 matrix
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