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.
Get the area codes from a list of phone numbers
All your base are belong to us
Given a matrix, swap the 2nd & 3rd columns
02 - Vector Variables 1
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