From a usability point of view, returning a string to indicate nothing found is probably the worst. an empty value or 0 would be much better.
Guillaume, I would say that that depends upon the intended 'audience' for the output.
Remove the vowels
Project Euler: Problem 1, Multiples of 3 and 5
Multiply 2 numbers
construct matrix with identical rows
Evaluating a polynomial
Matlab Basics - Create a row vector
Matlab Basics - Assigning Variables
Matlab Basics - Rounding I
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - Rounding III
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