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.
Number of 1s in the Binary Representation of a Number
Find the largest value in the 3D matrix
"Low : High - Low : High - Turn around " -- Create a subindices vector
Replace multiples of 5 with NaN
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