Here's something that comes up all the time if you deal with web pages.
Given a hexadecimal color specification of the form #FFFFFF, convert it to a 3 element MATLAB color specification. Remember that MATLAB RGB color values are between 0 and 1.
The input is a string starting with '#'. The output should be a 1-by-3 vector.
Input '#0000FF' Output [0 0 1]
Input '#33FF00' Output [0.2 1 0]