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.
Remove the polynomials that have positive real elements of their roots.
Back to basics 9 - Indexed References
Flag largest magnitude swings as they occur
02 - Vector Variables 5
Sum of diagonals elements of a matrix
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