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.
Determine whether a vector is monotonically increasing
Find the numeric mean of the prime numbers in a matrix.
Is it a number?
Sum of series I
Sum of series II
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