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.
Swap the first and last columns
Encode Roman Numerals
Read a column of numbers and interpolate missing data
Similar Triangles - find the height of the tree
Angle between two vectors
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