This problem requires more test cases. My solution as many others would fail for a case in which the searched substring is not ordered.
Summing Digits within Text
Test for balanced parentheses
Convert a numerical matrix into a cell array of strings
letter yes yes & letter no no
Get the length of a given vector
Neither minima nor maxima
Integer sequence - 2 : Kolakoski sequence
Integer Sequence - 1
Graph Algorithms - 1 : Length of the largest closed path
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